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<article id="post-mybatis教程" class="article article-type-post " itemscope itemprop="blogPost">
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      mybatis教程
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        <p>摘要：本篇文章主要讲解mybatis</p>
<span id="more"></span>



<h2 id="Mybatis教程"><a href="#Mybatis教程" class="headerlink" title="Mybatis教程"></a>Mybatis教程</h2><blockquote>
<p>一些值得写在前面的注意点：</p>
<p>Mybatis中的Mapper，所有类名都应当写完全限定名，或者别名，对于java常用的基本类型，mybatis都为其设定了别名，见4.2.③节</p>
</blockquote>
<h3 id="一、Intro"><a href="#一、Intro" class="headerlink" title="一、Intro"></a>一、Intro</h3><h4 id="1-1-什么是Mybatis"><a href="#1-1-什么是Mybatis" class="headerlink" title="1.1 什么是Mybatis"></a>1.1 什么是Mybatis</h4><ul>
<li>优秀的持久层框架</li>
<li>避免大量的JDBC代码（原先的Dao层代码就是JDBC代码）</li>
<li>通过xml或注解配置</li>
</ul>
<h4 id="1-2-持久化"><a href="#1-2-持久化" class="headerlink" title="1.2 持久化"></a>1.2 持久化</h4><p>数据持久化：</p>
<ul>
<li>数据持久化：将程序的数据由瞬时状态转化为持久状态的过程</li>
<li>内存：<strong>断电即失</strong></li>
<li>数据库（jdbc），io文件持久化</li>
</ul>
<p>为什么要持久化：</p>
<ul>
<li><p>有一些对象，不能丢掉（会员账号丢了就坏事）</p>
</li>
<li><p>内存太贵了</p>
</li>
</ul>
<h4 id="1-3-持久层"><a href="#1-3-持久层" class="headerlink" title="1.3 持久层"></a>1.3 持久层</h4><p>Dao层、Service层、Controller层</p>
<ul>
<li>完成持久化工作的代码块</li>
<li>层界限明显</li>
</ul>
<h4 id="1-4-为什么需要Mybatis"><a href="#1-4-为什么需要Mybatis" class="headerlink" title="1.4 为什么需要Mybatis"></a>1.4 为什么需要Mybatis</h4><ul>
<li>传统的JDBC代码太复杂了，需要简化。</li>
<li>框架的作用：自动化完成工作，避免重复性工作</li>
<li>解除sql与程序代码的耦合</li>
</ul>
<p>最重要的一点：用的人多！</p>
<p>Spring→Spring MVC→Springboot</p>
<h3 id="二、第一个Mybatis程序"><a href="#二、第一个Mybatis程序" class="headerlink" title="二、第一个Mybatis程序"></a>二、第一个Mybatis程序</h3><h4 id="2-0-创建数据库"><a href="#2-0-创建数据库" class="headerlink" title="2.0 创建数据库"></a>2.0 创建数据库</h4><h4 id="2-1-搭建环境"><a href="#2-1-搭建环境" class="headerlink" title="2.1 搭建环境"></a>2.1 搭建环境</h4><p>配置maven，需要<strong>三个包</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--    mybatis驱动    --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.mybatis<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mybatis<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>3.5.7<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!--    数据库驱动    --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>mysql<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mysql-connector-java<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>8.0.27<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!--     junit单元测试       --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>junit<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>junit<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>4.13.2<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">scope</span>&gt;</span>test<span class="tag">&lt;/<span class="name">scope</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h4 id="2-2-配置mybatis"><a href="#2-2-配置mybatis" class="headerlink" title="2.2 配置mybatis"></a>2.2 配置mybatis</h4><blockquote>
<p>首先梳理一下mybatis的工作流程：</p>
<p>​    mybatis的一个基本工作单元是sqlSession，sqlSession就原先JDBC中的connection</p>
<p>“每个线程都应该有它自己的 SqlSession 实例。SqlSession 的实例不是线程安全的，因此是不能被共享的，所以它的最佳的作用域是请求或方法作用域。”                    </p>
</blockquote>
<p>STEP：以下七步每步都需要代码实现，我将一一讲述</p>
<blockquote>
<ol>
<li>Mybatis是基于工厂模式，所以需要搭建一个sqlSessionFactory</li>
</ol>
<p>“SqlSessionFactory 一旦被创建就应该在应用的运行期间一直存在，没有任何理由丢弃它或重新创建另一个实例”</p>
<p>即sqlSession工厂应当是唯一且持续存在的，不应当创建新的sqlSessionFactory”</p>
<ol start="2">
<li>有了工厂，还需要参数信息，才能制作出合格的产品，而这份参数信息，就是mybatis-config.xml</li>
</ol>
<p>这份参数信息通常包含了以下四个要素 </p>
<ul>
<li>driver：驱动 </li>
<li>url：数据库地址</li>
<li>username：账户名</li>
<li>password：账户密码</li>
</ul>
<p>————有了基本工作单元sqlSession，就可以开始工作了————</p>
<ol start="3">
<li><p>创建实体类，eg：User</p>
</li>
<li><p>【※】创建实体类对应的Mapper接口，eg：UserMapper</p>
<p>这里的Mapper就是原来的DAO</p>
</li>
<li><p>【※】创建接口对应的Mapper.xml，eg：UserMapper.xml</p>
<p>这里需要注意，是与原先JDBC区别最大的地方，原先JDBC有了接口以后，需要创建实现类，然后才能执行，而Mybatis则是需要创建xml配置文件</p>
<ul>
<li><p>注意：写完Mapper后需要注册Mapper，在mybatis-Config中注册</p>
</li>
<li><p>~~~xml<br><mapper resource="com/mars/dao/UserMapper.xml"></mapper></p>
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class="line">152</span><br><span class="line">153</span><br><span class="line">154</span><br><span class="line">155</span><br><span class="line">156</span><br><span class="line">157</span><br><span class="line">158</span><br><span class="line">159</span><br><span class="line">160</span><br><span class="line">161</span><br><span class="line">162</span><br><span class="line">163</span><br><span class="line">164</span><br><span class="line">165</span><br><span class="line">166</span><br><span class="line">167</span><br><span class="line">168</span><br><span class="line">169</span><br><span class="line">170</span><br><span class="line">171</span><br><span class="line">172</span><br><span class="line">173</span><br><span class="line">174</span><br><span class="line">175</span><br><span class="line">176</span><br><span class="line">177</span><br><span class="line">178</span><br><span class="line">179</span><br><span class="line">180</span><br><span class="line">181</span><br><span class="line">182</span><br><span class="line">183</span><br><span class="line">184</span><br><span class="line">185</span><br><span class="line">186</span><br><span class="line">187</span><br><span class="line">188</span><br><span class="line">189</span><br><span class="line">190</span><br><span class="line">191</span><br><span class="line">192</span><br><span class="line">193</span><br><span class="line">194</span><br><span class="line">195</span><br><span class="line">196</span><br><span class="line">197</span><br><span class="line">198</span><br><span class="line">199</span><br><span class="line">200</span><br><span class="line">201</span><br><span class="line">202</span><br></pre></td><td class="code"><pre><span class="line"></span><br><span class="line">6. Test测试</span><br><span class="line"></span><br><span class="line">7. 【补充】：最好在maven的pom配置中添加以下代码，用以解决java文件夹下无法导入的xml文件问题</span><br><span class="line"></span><br><span class="line">   ```xml</span><br><span class="line">   &lt;build&gt;</span><br><span class="line">       &lt;resources&gt;</span><br><span class="line">           &lt;resource&gt;</span><br><span class="line">               &lt;directory&gt;src/main/resources&lt;/directory&gt;</span><br><span class="line">               &lt;includes&gt;</span><br><span class="line">                   &lt;include&gt;**/*.properties&lt;/include&gt;</span><br><span class="line">                   &lt;include&gt;**/*.xml&lt;/include&gt;</span><br><span class="line">               &lt;/includes&gt;</span><br><span class="line">               &lt;filtering&gt;true&lt;/filtering&gt;</span><br><span class="line">           &lt;/resource&gt;</span><br><span class="line">           &lt;resource&gt;</span><br><span class="line">               &lt;directory&gt;src/main/java&lt;/directory&gt;</span><br><span class="line">               &lt;includes&gt;</span><br><span class="line">                   &lt;include&gt;**/*.properties&lt;/include&gt;</span><br><span class="line">                   &lt;include&gt;**/*.xml&lt;/include&gt;</span><br><span class="line">               &lt;/includes&gt;</span><br><span class="line">               &lt;filtering&gt;true&lt;/filtering&gt;</span><br><span class="line">           &lt;/resource&gt;</span><br><span class="line">       &lt;/resources&gt;</span><br><span class="line">   &lt;/build&gt;</span><br><span class="line">   ```</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">每个基于Mybatis的应用都是以一个SqlSessionFactory的实例为核心的</span><br><span class="line"></span><br><span class="line">SqlSessionFactoryBuilder通过XML文件构建出SqlSessionFactory</span><br><span class="line"></span><br><span class="line">**STEP1：建立sqlSessionFactory工厂（工具类）**</span><br><span class="line"></span><br><span class="line">```java</span><br><span class="line">public class MybatisUtils &#123;</span><br><span class="line">//提升作用域为类变量</span><br><span class="line">   private static SqlSessionFactory sqlSessionFactory;</span><br><span class="line"></span><br><span class="line">   static &#123;</span><br><span class="line">       try &#123;</span><br><span class="line">           //固定操作</span><br><span class="line">           //建立IO 读取资源 构建工厂 </span><br><span class="line">           //建立sqlSession工厂</span><br><span class="line">           String resource = &quot;org/mybatis/example/mybatis-config.xml&quot;;</span><br><span class="line">           InputStream inputStream = Resources.getResourceAsStream(resource);</span><br><span class="line">           sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);</span><br><span class="line">       &#125;</span><br><span class="line">       catch (Exception e)&#123;</span><br><span class="line">       &#125;</span><br><span class="line">   &#125;</span><br><span class="line">   public static SqlSession getSqlSession()&#123;</span><br><span class="line">       SqlSession sqlSession = sqlSessionFactory.openSession();</span><br><span class="line">       return sqlSession;</span><br><span class="line">       //把这玩意理解成原来的connection对象即可</span><br><span class="line">       //sqlSession就是用来操作数据库对象的</span><br><span class="line">       </span><br><span class="line">       //类比理解：</span><br><span class="line">       //Connection connection = BaseDao.reachConnection()</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">```</span><br><span class="line"></span><br><span class="line">**STEP2：配置xml，这个xml主要是用来设置连接信息的【核心设置】**</span><br><span class="line"></span><br><span class="line">##### 编码问题，注意应当为UTF8，而不是UTF-8</span><br><span class="line"></span><br><span class="line">```xml</span><br><span class="line">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF8&quot; ?&gt;</span><br><span class="line">&lt;configuration&gt;</span><br><span class="line">   &lt;environments default=&quot;development&quot;&gt;</span><br><span class="line">       &lt;environment id=&quot;development&quot;&gt;</span><br><span class="line">           &lt;transactionManager type=&quot;JDBC&quot;/&gt;</span><br><span class="line">           &lt;dataSource type=&quot;POOLED&quot;&gt;</span><br><span class="line">               &lt;property name=&quot;driver&quot; value=&quot;com.mysql.jdbc.Driver&quot;/&gt;</span><br><span class="line">               &lt;property name=&quot;url&quot; value=&quot;jdbc:mysql://localhost:3306/mybatis?useSSl=true&amp;amp;useUnicode=true&amp;amp;characterEncoding=UTF-8&quot;/&gt;</span><br><span class="line">               &lt;property name=&quot;username&quot; value=&quot;root&quot;/&gt;</span><br><span class="line">               &lt;property name=&quot;password&quot; value=&quot;123456&quot;/&gt;</span><br><span class="line">           &lt;/dataSource&gt;</span><br><span class="line">       &lt;/environment&gt;</span><br><span class="line">   &lt;/environments&gt;</span><br><span class="line">   &lt;mappers&gt;</span><br><span class="line">       &lt;mapper resource=&quot;org/mybatis/example/BlogMapper.xml&quot;/&gt;</span><br><span class="line">   &lt;/mappers&gt;</span><br><span class="line">&lt;/configuration&gt;</span><br><span class="line">```</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">接下来进入业务代码方面，以上两步写完了就完了，基本不会再去修改，而下面的业务代码的部分，才是我们需要着重写的部分</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">#### 2.3 编写业务代码</span><br><span class="line"></span><br><span class="line">- 实体类</span><br><span class="line"></span><br><span class="line">```java</span><br><span class="line">package com.mars.pojo;</span><br><span class="line"></span><br><span class="line">public class User&#123;</span><br><span class="line">   private int id;</span><br><span class="line">   private String name;</span><br><span class="line">   private String pwd;</span><br><span class="line"></span><br><span class="line">   public User() &#123;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public User(int id, String name, String pwd) &#123;</span><br><span class="line">       this.id = id;</span><br><span class="line">       this.name = name;</span><br><span class="line">       this.pwd = pwd;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public int getId() &#123;</span><br><span class="line">       return id;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public void setId(int id) &#123;</span><br><span class="line">       this.id = id;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public String getName() &#123;</span><br><span class="line">       return name;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public void setName(String name) &#123;</span><br><span class="line">       this.name = name;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public String getPwd() &#123;</span><br><span class="line">       return pwd;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   public void setPwd(String pwd) &#123;</span><br><span class="line">       this.pwd = pwd;</span><br><span class="line">   &#125;</span><br><span class="line"></span><br><span class="line">   @Override</span><br><span class="line">   public String toString() &#123;</span><br><span class="line">       return &quot;User&#123;&quot; +</span><br><span class="line">               &quot;id=&quot; + id +</span><br><span class="line">               &quot;, name=&#x27;&quot; + name + &#x27;\&#x27;&#x27; +</span><br><span class="line">               &quot;, pwd=&#x27;&quot; + pwd + &#x27;\&#x27;&#x27; +</span><br><span class="line">               &#x27;&#125;&#x27;;</span><br><span class="line">   &#125;</span><br><span class="line">&#125;</span><br><span class="line">```</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">- Mapper接口</span><br><span class="line"></span><br><span class="line">```java</span><br><span class="line">public interface UserMapper &#123;</span><br><span class="line"></span><br><span class="line">   List&lt;User&gt; getUserList();</span><br><span class="line"></span><br><span class="line">&#125;</span><br><span class="line">```</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">- 接口对应的Mapper.xml</span><br><span class="line"></span><br><span class="line">```xml</span><br><span class="line">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;</span><br><span class="line">&lt;!DOCTYPE mapper</span><br><span class="line">       PUBLIC &quot;-//mybatis.org//DTD Mapper 3.0//EN&quot;</span><br><span class="line">       &quot;http://mybatis.org/dtd/mybatis-3-mapper.dtd&quot;&gt;</span><br><span class="line"></span><br><span class="line">&lt;mapper namespace=&quot;com.mars.dao.UserMapper&quot;&gt;</span><br><span class="line">   &lt;select id=&quot;getUserList&quot; resultType=&quot;com.mars.pojo.User&quot;&gt;</span><br><span class="line">       select * from user</span><br><span class="line">   &lt;/select&gt;</span><br><span class="line">&lt;/mapper&gt;</span><br><span class="line">```</span><br><span class="line"></span><br><span class="line">插曲：这里的namespace和resultType都要通过指出具体位置！！</span><br><span class="line"></span><br><span class="line">mybatis神奇的一点是：如果Mapper和xml的任一者有问题，sqlSession直接就没法建造！！</span><br><span class="line"></span><br><span class="line"></span><br><span class="line"></span><br><span class="line">resultType是返回结果的存在形式，常用以下两种</span><br><span class="line"></span><br><span class="line">- resulttype</span><br><span class="line"></span><br><span class="line">  resulttype =  接口集合中该方法的返回类型，如果是泛型集合的形式，则返回泛型即可</span><br><span class="line"></span><br><span class="line">- resultmap</span><br><span class="line"></span><br><span class="line">- 注册Mapper（mybatis-config中）</span><br><span class="line"></span><br><span class="line">~~~xml</span><br><span class="line">&lt;mapper resource=&quot;com/mars/dao/UserMapper.xml&quot;&gt;&lt;/mapper&gt;</span><br></pre></td></tr></table></figure></li>
</ul>
</li>
</ol>
</blockquote>
<h4 id="2-4-测试"><a href="#2-4-测试" class="headerlink" title="2.4 测试"></a>2.4 测试</h4><blockquote>
<p>测试中的文件结构最好与java源文件中保持一致</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    <span class="comment">//第一步：获得SqlSession对象（执行sql语句的基本单元嘛）</span></span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line"></span><br><span class="line">    <span class="comment">//第二步：拿到接口实现类的对象（）</span></span><br><span class="line">    UserMapper userMapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line"></span><br><span class="line">    <span class="comment">//调用实现类的对象的方法</span></span><br><span class="line">    List&lt;User&gt; userList = userMapper.getUserList();</span><br><span class="line"></span><br><span class="line">    <span class="keyword">for</span> (User user : userList) &#123;</span><br><span class="line">        System.out.println(user);</span><br><span class="line">    &#125;</span><br><span class="line">	</span><br><span class="line">    <span class="comment">//最后要关闭sqlSession，就像关闭connection一样</span></span><br><span class="line">    sqlSession.close();</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<blockquote>
<p><strong>注意这里的Interface.class写法：表示返回一个实现该接口的实例</strong></p>
</blockquote>
<p><strong>注意：要记得关闭sqlSession</strong></p>
<blockquote>
<p>“每次收到 HTTP 请求，就可以打开一个 SqlSession，返回一个响应后，就关闭它。”</p>
</blockquote>
<p><strong>注意：可能会遇到的错误</strong></p>
<ul>
<li>配置文件没有注册</li>
<li>绑定接口错误</li>
<li>方法名不对</li>
<li>返回类型不对</li>
<li>Maven导出资源问题</li>
</ul>
<blockquote>
<p>深度对比mybatis做了哪些改变</p>
</blockquote>
<table>
<thead>
<tr>
<th></th>
<th>JDBC</th>
<th>Mybtatis</th>
</tr>
</thead>
<tbody><tr>
<td>加载驱动\URL\账号密码</td>
<td>反射\类加载器读取配置文件</td>
<td>mybatis-config中直接配置</td>
</tr>
<tr>
<td>定义实体类</td>
<td>-</td>
<td>-</td>
</tr>
<tr>
<td>定义与数据库交互的接口</td>
<td>UserDao</td>
<td>UserMapper</td>
</tr>
<tr>
<td>定义与数据库交互的实体</td>
<td>UserDaoImpl</td>
<td>UserMapper.xml</td>
</tr>
<tr>
<td>创建与数据库交互的实体</td>
<td>new UserDaoImpl</td>
<td>sqlSession.getMapper</td>
</tr>
<tr>
<td>连接数据库</td>
<td>Connection</td>
<td>sqlSession</td>
</tr>
<tr>
<td>获取执行对象</td>
<td>Statement</td>
<td>\</td>
</tr>
<tr>
<td>创建结果集对象</td>
<td>ResultSet</td>
<td>\</td>
</tr>
</tbody></table>
<h3 id="三、CRUD"><a href="#三、CRUD" class="headerlink" title="三、CRUD"></a>三、CRUD</h3><p>注：</p>
<ol>
<li>写测试的时候，先把创建sqlSession和关闭sqSession写上，在这俩之间写内容</li>
<li>sql语句中用 #{parameter} 来取参数值 </li>
</ol>
<h4 id="3-1-增：Create——Insert"><a href="#3-1-增：Create——Insert" class="headerlink" title="3.1 增：Create——Insert"></a>3.1 增：Create——Insert</h4><p><strong>接口：</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">addUser</span><span class="params">(User user)</span></span>;</span><br></pre></td></tr></table></figure>

<p><strong>xml：</strong></p>
<blockquote>
<p>指定参数类型为实体类后，可以直接使用实体类对象的参数</p>
<p>实体类顺序与数据库字段顺序没必要一致，甚至名字也没必要一致，因为如下语句已经指明了关系</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--  牛逼的在这里，指定实体类之后，就可以直接使用该实体类对象中的参数  --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">insert</span> <span class="attr">id</span>=<span class="string">&quot;addUser&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;com.mars.pojo.User&quot;</span>&gt;</span></span><br><span class="line">    insert into user (`id`, `name`, `pwd`) values (#&#123;id&#125;,#&#123;name&#125;,#&#123;pwd&#125;);</span><br><span class="line"><span class="tag">&lt;/<span class="name">insert</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>测试：</strong></p>
<blockquote>
<p>注1：增删改需要commit，不commit是没有效果的</p>
<p>注2：增删改成功后不会返回任何结果集，可以设置返回类型为int，如果返回成功，值为1</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testInsert</span><span class="params">()</span></span>&#123;</span><br><span class="line"></span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line"></span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line"></span><br><span class="line">    <span class="keyword">int</span> temp = mapper.addUser(<span class="keyword">new</span> User(<span class="number">6</span>,<span class="string">&quot;F&quot;</span>,<span class="string">&quot;998877&quot;</span>));</span><br><span class="line">    System.out.println(temp);</span><br><span class="line">	</span><br><span class="line">    sqlSession.commit();</span><br><span class="line">    sqlSession.close();</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h4 id="3-2-查：Retrieve——select"><a href="#3-2-查：Retrieve——select" class="headerlink" title="3.2 查：Retrieve——select"></a>3.2 查：Retrieve——select</h4><blockquote>
<p>如果要传递多个参数，最好使用注解，见第八节</p>
<p>也可以使用map参数类型</p>
</blockquote>
<p><strong>接口：</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">User <span class="title">getUserById</span><span class="params">(<span class="keyword">int</span> id)</span></span>;</span><br></pre></td></tr></table></figure>

<p><strong>xml：</strong></p>
<blockquote>
<p>在只有一个参数的时候，sql语句中的参数名随便写，参数类型不用写</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserById&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;com.mars.pojo.User&quot;</span>&gt;</span></span><br><span class="line">    select * from user where id = #&#123;xxx&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>测试：</strong></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testGUBI</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line">    User userById = mapper.getUserById(<span class="number">1</span>);</span><br><span class="line">    System.out.println(userById);</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>



<h4 id="3-3-改：Update——update"><a href="#3-3-改：Update——update" class="headerlink" title="3.3 改：Update——update"></a>3.3 改：Update——update</h4><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">updateUser</span><span class="params">(User user)</span></span>;</span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">update</span> <span class="attr">id</span>=<span class="string">&quot;updateUser&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;com.mars.pojo.User&quot;</span>&gt;</span></span><br><span class="line">    update user</span><br><span class="line">    set name = #&#123;name&#125;, pwd = #&#123;pwd&#125;</span><br><span class="line">    where id=#&#123;id&#125; ;</span><br><span class="line"><span class="tag">&lt;/<span class="name">update</span>&gt;</span></span><br></pre></td></tr></table></figure>

<h4 id="3-4-删：Delete——delete"><a href="#3-4-删：Delete——delete" class="headerlink" title="3.4 删：Delete——delete"></a>3.4 删：Delete——delete</h4><p>略</p>
<blockquote>
<p>通过以上四个简单的CRUD例子，体会到mybatis的强大之处：</p>
<ul>
<li>结构规范：一个方法对应一个xml中的sql语句，无需关注实现</li>
<li>直接与实体类交互：既可以直接将查询结果设定成实体类对象；又可以把实体类对象作为参数传入sql语句，以便直接使用其属性</li>
<li></li>
</ul>
</blockquote>
<h4 id="3-5-Map详解："><a href="#3-5-Map详解：" class="headerlink" title="3.5 Map详解："></a>3.5 Map详解：</h4><blockquote>
<p>引入：</p>
<p>我们在业务中经常会遇到这样一种情况，即查询时需要多个条件，例如我们需要同时拿着name和age来查User。此时单参数就不满足了，而直接把整个对象user传进来似乎也没必要，这时候，map就应运而生</p>
</blockquote>
<ol>
<li>接口</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">User <span class="title">getUserByIdName</span><span class="params">(Map&lt;String, Object&gt; map)</span></span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>Mapper.xml</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserByIdName&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;User&quot;</span>&gt;</span></span><br><span class="line">    select * from user where id = #&#123;id&#125; and name = #&#123;name&#125;;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="3">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">testSelect</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line">    HashMap&lt;String,Object&gt; map = <span class="keyword">new</span> HashMap&lt;&gt;();</span><br><span class="line">    map.put(<span class="string">&quot;id&quot;</span>,<span class="number">1</span>);</span><br><span class="line">    map.put(<span class="string">&quot;name&quot;</span>,<span class="string">&quot;A&quot;</span>);</span><br><span class="line">    User user = mapper.getUserByIdName(map);</span><br><span class="line">    System.out.println(user);</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>总结：</p>
<ul>
<li>当需要传递多个参数时，在接口中指明参数类型为Map&lt;String，Object&gt;，前者表示键的类型为字符串，后者表示值的类型为对象</li>
<li>mapper中指明参数类型为map</li>
<li>使用方法为，直接在sql中拿键名即可，这就要求sql中的    <strong>#{ xx }</strong>    xx必须与测试中提供的键名相同才可以</li>
</ul>
<blockquote>
<p>综上：需要传递多个参数时，有以下几个手段</p>
<p>A：用Map，注意键名与sql中的参数名一致</p>
<p>B：用对象，对象的属性可以直接使用，参考3.3节</p>
<p>C：用注解</p>
</blockquote>
<h4 id="3-6-模糊查询（？？？）"><a href="#3-6-模糊查询（？？？）" class="headerlink" title="3.6 模糊查询（？？？）"></a>3.6 模糊查询（？？？）</h4><p>两种方法：</p>
<p>A：Java代码执行的时候，传递通配符% %</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">List&lt;User&gt; userList = mapper.getUserLike(<span class="string">&quot;%李%&quot;</span>);</span><br></pre></td></tr></table></figure>

<p>B：在sql拼接中使用通配符</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="operator">*</span> <span class="keyword">from</span> <span class="keyword">user</span> <span class="keyword">where</span> name <span class="keyword">like</span> &quot;%&quot;#&#123;<span class="keyword">value</span>&#125;&quot;%&quot;</span><br></pre></td></tr></table></figure>

<p>所以哪种安全？</p>
<p>关于sql注入问题</p>
<p><a target="_blank" rel="noopener" href="https://baijiahao.baidu.com/s?id=1654523881624000395&wfr=spider&for=pc">MyBatis系列：模糊查询的4种实现方式 (baidu.com)</a></p>
<h4 id="3-7-常见错误"><a href="#3-7-常见错误" class="headerlink" title="3.7 常见错误"></a>3.7 常见错误</h4><blockquote>
<p>对于mybatis，检查异常信息时从下往上看</p>
</blockquote>
<ul>
<li>namespace应与接口一致</li>
<li>resource 绑定 mapper，要使用/路径形式，而不要使用.package.mars等包名形式</li>
<li>xml文件中中文报错，将编码方式改为UTF8即可</li>
</ul>
<h3 id="四、配置解析"><a href="#四、配置解析" class="headerlink" title="四、配置解析"></a>四、配置解析</h3><h4 id="4-1-核心配置文件——mybatis-config-xml"><a href="#4-1-核心配置文件——mybatis-config-xml" class="headerlink" title="4.1 核心配置文件——mybatis-config.xml"></a>4.1 核心配置文件——mybatis-config.xml</h4><p>配置文件结构：</p>
<blockquote>
<p>必须按照以下顺序组织</p>
</blockquote>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line">configuration（配置）</span><br><span class="line">    properties（属性）</span><br><span class="line">    settings（设置）</span><br><span class="line">    typeAliases（类型别名）</span><br><span class="line">    typeHandlers（类型处理器）</span><br><span class="line">    objectFactory（对象工厂）</span><br><span class="line">    plugins（插件）</span><br><span class="line">    environments（环境配置）</span><br><span class="line">    	environment（环境变量）</span><br><span class="line">    		transactionManager（事务管理器）</span><br><span class="line">    		dataSource（数据源）</span><br><span class="line">    databaseIdProvider（数据库厂商标识）</span><br><span class="line">    mappers（映射器）</span><br></pre></td></tr></table></figure>



<h4 id="4-2-属性详解"><a href="#4-2-属性详解" class="headerlink" title="4.2 属性详解"></a>4.2 属性详解</h4><blockquote>
<p>写在前面——常见异常：属性顺序写错了，改顺序</p>
<p>The content of element type “configuration” must match “(properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,reflectorFactory?,plugins?,environments?,databaseIdProvider?,mappers?)”.</p>
</blockquote>
<h5 id="①environments："><a href="#①environments：" class="headerlink" title="①environments："></a>①environments：</h5><p>environments中可以配置多套属性</p>
<blockquote>
<p>使用场景：需要连接不同数据库，例如MySQL，oracle都要用，就需要多套环境</p>
</blockquote>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">environment</span> <span class="attr">id</span>=<span class="string">&quot;development&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">&quot;JDBC&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">&quot;POOLED&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>= <span class="string">value</span>=<span class="string">/</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dataSource</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">environment</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">environment</span> <span class="attr">id</span>=<span class="string">&quot;test&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">transactionManager</span> <span class="attr">type</span>=<span class="string">&quot;JDBC&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">transactionManager</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">&quot;POOLED&quot;</span>&gt;</span></span><br><span class="line">    	<span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>= <span class="string">value</span>=<span class="string">/</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dataSource</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">environment</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li><p>transactionManager：事务管理器，包括JDBC和MANAGED</p>
<p> “如果你正在使用 Spring + MyBatis，则没有必要配置事务管理器，因为 Spring 模块会使用自带的管理器来覆盖前面的配置。”</p>
</li>
<li><p>dataSource：数据源，包括UNPOOLED、POOLED、JNDI</p>
<ol>
<li>UNPOOLED：无池，即每次就请求时打开连接，请求完后关闭连接</li>
<li>POOLED：池化，即预先创建好一定数量的连接池，避免了创建新的连接实例时所必需的初始化和认证时间。 这种处理方式很流行，能使并发 Web 应用快速响应请求。</li>
<li>JNDI：在EJB或应用服务器中使用【较少使用】</li>
</ol>
</li>
</ul>
<h5 id="②properties："><a href="#②properties：" class="headerlink" title="②properties："></a><strong>②properties：</strong></h5><blockquote>
<p>environment中不建议把property写死，建议写到配置文件中</p>
</blockquote>
<p>在配置文件中引入：</p>
<p>将db.properties放在resources目录下后，可以采用如下方式引用</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">properties</span> <span class="attr">resource</span>=<span class="string">&quot;db.properties&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>db.properties：</p>
<figure class="highlight properties"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">driver</span>=<span class="string">com.mysql.cj.jdbc.Driver</span></span><br><span class="line"><span class="attr">url</span>=<span class="string">jdbc:mysql://localhost:3306/mybatis?userSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC</span></span><br><span class="line"><span class="attr">username</span>=<span class="string">root</span></span><br><span class="line"><span class="attr">password</span>=<span class="string">123456</span></span><br></pre></td></tr></table></figure>

<p>引入后，在environment中通过如下方式引用即可：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">dataSource</span> <span class="attr">type</span>=<span class="string">&quot;POOLED&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;driver&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;driver&#125;&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;url&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;url&#125;&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;username&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;username&#125;&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;password&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;password&#125;&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dataSource</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>补充：可以在properties标签中添加如下字段，来设置局内属性作为补充，如果存在同名冲突情况下，其优先级低于外部配置文件</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">properties</span> <span class="attr">resource</span>=<span class="string">&quot;db.properties&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;username&quot;</span> <span class="attr">value</span>=<span class="string">&quot;dev_user&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;password&quot;</span> <span class="attr">value</span>=<span class="string">&quot;F2Fa3!33TYyg&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">properties</span>&gt;</span></span><br></pre></td></tr></table></figure>



<blockquote>
<p>补充：</p>
<p>如果直接在xml中写配置属性的话，需要把 &amp; 变成 &amp;amp；</p>
<p>后者是html、xml中 &amp; 的转义符，即在html、xml中书写 &amp; 需要写成后者</p>
<p>所以：</p>
<p>在xml中</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;url&quot;</span> <span class="attr">value</span>=<span class="string">&quot;jdbc:mysql://localhost:3306/mybatis?useSSl=true<span class="symbol">&amp;amp;</span>useUnicode=true<span class="symbol">&amp;amp;</span>characterEncoding=UTF-8&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p>而在db.properties中，应当把 &amp;amp；还给变成 &amp; </p>
<p>即</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">url = jdbc:mysql://localhost:3306/mybatis?userSSL=true&amp;useUnicode=true&amp;characterEncoding=UTF-8&amp;serverTimezone=UTC</span><br></pre></td></tr></table></figure>

<p>如果不注意这个细节，就会报错！</p>
</blockquote>
<h5 id="③类型别名typeAliases"><a href="#③类型别名typeAliases" class="headerlink" title="③类型别名typeAliases"></a>③类型别名typeAliases</h5><p>全局xml作用域，如果配置了别名，在所有的Mapper.xml中都可以使用</p>
<p><strong>方式一：指定类名</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--可以给实体类起别名--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">typeAlias</span> <span class="attr">type</span>=<span class="string">&quot;com.mars.pojo.User&quot;</span> <span class="attr">alias</span>=<span class="string">&quot;User&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>起别名后，就可以直接在Mapper中使用别名了，而不需要使用完全限定名</p>
<p><strong>方式二：指定包名</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;com.kuang.pojo&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>==指定包名后，会默认使用包中Bean的首字母小写的非限定类名作为别名==，例如以上指定的结果是，User被表示为user</p>
<ul>
<li><p>如果不想使用默认命名，可以通过注解来赋新的名，在实体类加上命名注解，eg：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//</span></span><br><span class="line"><span class="meta">@Alias(&quot;aaauuu&quot;)</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Author</span></span>&#123;</span><br><span class="line">	...</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure></li>
</ul>
<p>比较：</p>
<blockquote>
<p>在实体类比较少的时候，使用第一种方式。</p>
<p>如果实体类十分多，建议用第二种扫描包的方式。</p>
<p>第一种可以DIY别名，第二种不行，如果非要改，需要在实体上增加注解。</p>
</blockquote>
<blockquote>
<p>一些基本类型的别名：（？？？）</p>
<table>
<thead>
<tr>
<th>别名</th>
<th>映射的类型</th>
</tr>
</thead>
<tbody><tr>
<td>_byte</td>
<td>byte</td>
</tr>
<tr>
<td>_long</td>
<td>long</td>
</tr>
<tr>
<td>_short</td>
<td>short</td>
</tr>
<tr>
<td>_int</td>
<td>int</td>
</tr>
<tr>
<td>_integer</td>
<td>int</td>
</tr>
<tr>
<td>_double</td>
<td>double</td>
</tr>
<tr>
<td>_float</td>
<td>float</td>
</tr>
<tr>
<td>_boolean</td>
<td>boolean</td>
</tr>
<tr>
<td>string</td>
<td>String</td>
</tr>
<tr>
<td>byte</td>
<td>Byte</td>
</tr>
<tr>
<td>long</td>
<td>Long</td>
</tr>
<tr>
<td>short</td>
<td>Short</td>
</tr>
<tr>
<td>int</td>
<td>Integer</td>
</tr>
<tr>
<td>integer</td>
<td>Integer</td>
</tr>
<tr>
<td>double</td>
<td>Double</td>
</tr>
<tr>
<td>float</td>
<td>Float</td>
</tr>
<tr>
<td>boolean</td>
<td>Boolean</td>
</tr>
<tr>
<td>date</td>
<td>Date</td>
</tr>
</tbody></table>
<p>在这里，我们发现，你直接写八大基本类型，会被映射为对应的类，这是有特殊含义的</p>
<p>eg：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">delete</span> <span class="attr">id</span>=<span class="string">&quot;deleteUser&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;int&quot;</span>&gt;</span></span><br><span class="line">    delete from user where id = #&#123;id&#125;;</span><br><span class="line"><span class="tag">&lt;/<span class="name">delete</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>对于xml中的sql语句，通常情况下，我们更希望标签接收（parameterType）的是对象，返回（ResultType）的也是对象，这样整体更统一</p>
</blockquote>
<h5 id="④设置Settings"><a href="#④设置Settings" class="headerlink" title="④设置Settings"></a>④设置Settings</h5><table>
<thead>
<tr>
<th>lazyLoadingEnabled</th>
<th>延迟加载的全局开关。当开启时，所有关联对象都会延迟加载。 特定关联关系中可通过设置 <code>fetchType</code> 属性来覆盖该项的开关状态。</th>
<th>true | false</th>
</tr>
</thead>
<tbody><tr>
<td></td>
<td></td>
<td></td>
</tr>
</tbody></table>
<h5 id="⑤其他配置"><a href="#⑤其他配置" class="headerlink" title="⑤其他配置"></a>⑤其他配置</h5><ul>
<li><a target="_blank" rel="noopener" href="https://mybatis.org/mybatis-3/zh/configuration.html#typeHandlers">typeHandlers（类型处理器）</a></li>
<li><a target="_blank" rel="noopener" href="https://mybatis.org/mybatis-3/zh/configuration.html#objectFactory">objectFactory（对象工厂）</a></li>
<li>plugins 插件<ul>
<li>mybatis-generator-core</li>
<li>mybatis-plus</li>
<li>通用mapper</li>
</ul>
</li>
</ul>
<h5 id="⑥Mappers映射器："><a href="#⑥Mappers映射器：" class="headerlink" title="⑥Mappers映射器："></a>⑥Mappers映射器：</h5><p>用来注册mapper，当mapper.xml编写完成后需要注册，有以下两种方式：</p>
<p>方式一：使用完全限定名，<strong>注册xml文件</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--每一个Mapper.xml都需要在MyBatis核心配置文件中注册--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">resource</span>=<span class="string">&quot;com/mars/dao/UserMapper.xml&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>**无要求，但路径要写对，路径分隔符是  /  而不是  .  **</p>
<p>resource路径就是resources文件夹下的路径</p>
<p>方式二：使用class注册，<strong>直接注册Mapper接口</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--每一个Mapper.xml都需要在MyBatis核心配置文件中注册--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">class</span>=<span class="string">&quot;com.mars.dao.UserMapper&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>要求：</p>
<ul>
<li><p>Mapper接口和它的实现（mapper.xml）必须同名</p>
</li>
<li><p>Mapper接口和它的实现（mapper.xml）必须在同一个包（xml放在resources文件夹也ok，但是应当具有相同的目录结构）下</p>
</li>
</ul>
<blockquote>
<p>注意：sql语句可以同时使用注解和xml</p>
<p><strong>方式一和方式二注册一个即可，注册了一个都可以同时使用注解和xml了</strong></p>
</blockquote>
<p><strong>方式三：使用包扫描，会把包中所有Mapper接口给注册了</strong>——方式二的plus</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;com.kuang.dao&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>要求：</p>
<ul>
<li><p>Mapper接口和它的实现（mapper.xml）必须同名</p>
</li>
<li><p>Mapper接口和它的实现（mapper.xml）必须在同一个包下</p>
</li>
</ul>
<h5 id="⑦作用域和生命周期问题"><a href="#⑦作用域和生命周期问题" class="headerlink" title="⑦作用域和生命周期问题"></a>⑦作用域和生命周期问题</h5><p>声明周期和作用域是至关重要的，因为错误的使用会导致非常严重的<strong>并发问题</strong>。</p>
<p><strong>SqlSessionFactoryBuilder:</strong></p>
<ul>
<li>一旦创建了SqlSessionFactory，就不再需要它了</li>
<li>局部变量</li>
</ul>
<p><strong>SqlSessionFactory:</strong></p>
<ul>
<li>将工厂理解成数据库连接池即可，当有请求时，提供连接，当处理完请求后，收回连接</li>
<li>SqlSessionFactory的最佳作用域是应用作用域（ApplocationContext）。</li>
<li>一旦被创建就应该在应用的运行期间一直存在，没有任何理由丢弃它或重新创建一个实例。</li>
<li>最简单的就是使用单例模式或静态单例模式。</li>
</ul>
<p><strong>SqlSession：</strong></p>
<ul>
<li>连接到连接池的一个请求</li>
<li>SqlSession 的实例不是线程安全的，因此是不能被共享的，所以它的最佳的作用域是请求或方法作用域。</li>
<li>用完之后需要赶紧关闭，否则资源被占用！</li>
</ul>
<h3 id="五、初识ResultMap"><a href="#五、初识ResultMap" class="headerlink" title="五、初识ResultMap"></a>五、初识ResultMap</h3><blockquote>
<p>引入：</p>
<p>我们原先的查询语句是这样的</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserById&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;int&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;com.mars.pojo.User&quot;</span>&gt;</span></span><br><span class="line"> select * from user where id = #&#123;id&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>我们曾经提到过：Mybatis牛逼的地方在于省略了大量的对ResultSet处理的代码，原先的处理手段是从ResultSet中获得一条记录，然后新建一个bean对象，用setter方法把bean对象的属性给set一遍之后，再返回这个bean对象。</p>
<p>而Mybatis完全不需要写，只需要指定resultType为bean实体类，就能直接拿到对象返回值</p>
<p>这其中，显然是Mybatis自动帮我们处理了</p>
<p>———————————————————————</p>
<p>但这存在一个问题：</p>
<p>当我们的实体类和数据库的对应字段名不一致时，查出来的结果就是对象该字段没被赋上值</p>
<p>对于上述查询语句</p>
<p>数据库为：id、name、pwd</p>
<p>User类为：id、name、password</p>
<p>用    id = 1    来查询</p>
<p>则查询结果为：<img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211126170339602.png" alt="image-20211126170339602" style="zoom: 67%;"></p>
</blockquote>
<ul>
<li>解决方法一：在查询时起别名</li>
</ul>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="operator">*</span> <span class="keyword">from</span> <span class="keyword">user</span></span><br><span class="line"><span class="comment">-- select * 的本质是将字段名直接作为结果输出，那么mybatis拿着数据库原生字段名去匹配bean对象自然找不到</span></span><br><span class="line"><span class="keyword">select</span> column1,column2 <span class="keyword">from</span> <span class="keyword">user</span></span><br></pre></td></tr></table></figure>

<p>所以，直接起别名就能解决这个问题</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> id,name,pwd <span class="keyword">as</span> password <span class="keyword">from</span> <span class="keyword">user</span></span><br></pre></td></tr></table></figure>

<p>起别名后，结果中的三条字段就是id、name、password与bean对应了，就可以赋值了</p>
<ul>
<li>解决方法二：使用resultMap</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;UserMap&quot;</span> <span class="attr">type</span>=<span class="string">&quot;User&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;id&quot;</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;name&quot;</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">column</span>=<span class="string">&quot;pwd&quot;</span> <span class="attr">property</span>=<span class="string">&quot;password&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserById&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;int&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;UserMap&quot;</span>&gt;</span></span><br><span class="line">    select * from user where id = #&#123;id&#125;;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>注意点：</p>
<p>resultMap中    id    表示该map的名字，在sql标签中，通过id来引用</p>
<p>resultMap中    type    表示返回值类型</p>
<p>result中    column    表示数据库字段名    ||    property    表示返回对象的属性名</p>
<h3 id="六、日志"><a href="#六、日志" class="headerlink" title="六、日志"></a>六、日志</h3><h4 id="6-1-日志工厂"><a href="#6-1-日志工厂" class="headerlink" title="6.1 日志工厂"></a>6.1 日志工厂</h4><p>如果一个数据库操作，出现了异常，我们需要排错。日志就是最好的助手</p>
<ul>
<li>曾经：sout、debug</li>
<li>现在：日志工厂</li>
</ul>
<p>具体使用哪个日志，在配置文件中设置即可</p>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211126185140431.png" alt="image-20211126185140431"><br><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211126185122188.png" alt="image-20211126185122188"></p>
<p>日志记录</p>
<ul>
<li>标准日志工厂，设置完后可以直接使用</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;logImpl&quot;</span> <span class="attr">value</span>=<span class="string">&quot;STDOUT_LOGGING&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211126190113894.png" alt="image-20211126190113894"></p>
<h4 id="6-2-LOG4J"><a href="#6-2-LOG4J" class="headerlink" title="6.2 LOG4J"></a>6.2 LOG4J</h4><p>什么是LOG4J：</p>
<ul>
<li><p>Log4j是Apache的一个开源项目，通过使用Log4j，我们可以控制日志信息输送的目的地是<a target="_blank" rel="noopener" href="https://baike.baidu.com/item/%E6%8E%A7%E5%88%B6%E5%8F%B0/2438626">控制台</a>、文件、<a target="_blank" rel="noopener" href="https://baike.baidu.com/item/GUI">GUI</a>组件</p>
</li>
<li><p>我们也可以控制每一条日志的输出格式；</p>
</li>
<li><p>通过定义每一条日志信息的级别，我们能够更加细致地控制日志的生成过程；</p>
</li>
<li><p>最令人感兴趣的就是，这些可以通过一个<a target="_blank" rel="noopener" href="https://baike.baidu.com/item/%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6/286550">配置文件</a>来灵活地进行配置，而不需要修改应用的代码。</p>
</li>
</ul>
<ol>
<li>先导入log4j的包</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- https://mvnrepository.com/artifact/log4j/log4j --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>log4j<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>log4j<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.2.17<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>



<p>简单使用：</p>
<p>导入Logger方法的包</p>
<p>【*】待完善</p>
<h3 id="七、分页"><a href="#七、分页" class="headerlink" title="七、分页"></a>七、分页</h3><h4 id="7-1-sql层面分页【推荐】"><a href="#7-1-sql层面分页【推荐】" class="headerlink" title="7.1 sql层面分页【推荐】"></a>7.1 sql层面分页【推荐】</h4><p>为什么要分页？</p>
<p>如果不分页，一次把数据库中的所有东西都查出来，显然不现实，也会给数据库和服务器带来很大的压力</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="operator">*</span> <span class="keyword">from</span> <span class="keyword">user</span> limit startIndex,pageSize</span><br><span class="line"><span class="comment">-- startIndex是包含的，数据库下标从0开始，0代表第一条记录</span></span><br><span class="line"><span class="comment">-- 即limit 0,2 得到第1，2条记录</span></span><br></pre></td></tr></table></figure>

<p>基于Sql的分页</p>
<ol>
<li>接口</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//分页</span></span><br><span class="line"><span class="function">List&lt;User&gt; <span class="title">getUserByLimit</span><span class="params">(Map&lt;String,Integer&gt; map)</span></span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>Mapper.xml</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserByLimit&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;UserMap&quot;</span>&gt;</span></span><br><span class="line">    select * from user limit #&#123;startIndex&#125;,#&#123;pageSize&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>


<ol start="3">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">getUserByLimit</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line">    HashMap&lt;String, Integer&gt; map = <span class="keyword">new</span> HashMap&lt;String, Integer&gt;();</span><br><span class="line">    map.put(<span class="string">&quot;startIndex&quot;</span>,<span class="number">1</span>);</span><br><span class="line">    map.put(<span class="string">&quot;pageSize&quot;</span>,<span class="number">2</span>);</span><br><span class="line">    List&lt;User&gt; list = mapper.getUserByLimit(map);</span><br><span class="line">    <span class="keyword">for</span> (User user : list) &#123;</span><br><span class="line">        System.out.println(user);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


<h4 id="7-2-RowBounds类【过时了】"><a href="#7-2-RowBounds类【过时了】" class="headerlink" title="7.2 RowBounds类【过时了】"></a>7.2 RowBounds类【过时了】</h4><p>通过java代码层面来实现</p>
<ol>
<li>接口</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">List&lt;User&gt; <span class="title">getUserByRowBounds</span><span class="params">()</span></span>;</span><br></pre></td></tr></table></figure>

<ol>
<li>mapper.xml</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getUserByRowBounds&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;UserMap&quot;</span>&gt;</span></span><br><span class="line">    select * from user ;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol>
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    RowBounds rowBounds = <span class="keyword">new</span> RowBounds(<span class="number">0</span>,<span class="number">2</span>);</span><br><span class="line">    List&lt;User&gt; user = sqlSession.selectList(<span class="string">&quot;com.mars.dao.UserMapper.getUserByRowBounds&quot;</span>,<span class="keyword">null</span>,rowBounds);</span><br><span class="line">    <span class="keyword">for</span> (User user1 : user) &#123;</span><br><span class="line">        System.out.println(user1);</span><br><span class="line">    &#125;</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<h4 id="7-3-分页插件"><a href="#7-3-分页插件" class="headerlink" title="7.3 分页插件"></a>7.3 分页插件</h4><p>略</p>
<h3 id="八、使用注解开发"><a href="#八、使用注解开发" class="headerlink" title="八、使用注解开发"></a>八、使用注解开发</h3><blockquote>
<p>注解，在运行中JVM会去读取它，并对相应数据进行的操作，会向程序员反遣被标元素的注解。</p>
<p>注释，会被编译器忽略。</p>
</blockquote>
<h4 id="8-1-面向接口编程"><a href="#8-1-面向接口编程" class="headerlink" title="8.1 面向接口编程"></a>8.1 面向接口编程</h4><p><strong>关键：接口与实现解耦</strong></p>
<p>好处：提高拓展性，复用性，分层开发中，上层不用管具体的实现，大家都遵守共同的标准，使得开发变得容易，规范性更好</p>
<h4 id="8-2-使用注解开发"><a href="#8-2-使用注解开发" class="headerlink" title="8.2 使用注解开发"></a>8.2 使用注解开发</h4><ol>
<li>注解在接口上实现</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Select(&quot;select * from user where id = #&#123;id&#125;&quot;)</span></span><br><span class="line"><span class="function">User <span class="title">getUserById</span><span class="params">(<span class="keyword">int</span> id)</span></span>;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li>需要在核心配置文件中注册接口（不管是注解还是xml都要注册）</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">mappers</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">mapper</span> <span class="attr">class</span>=<span class="string">&quot;com.kuang.dao.UserMapper&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mappers</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="3">
<li>测试</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);<span class="comment">//这句话本质是得到接口的实现类</span></span><br><span class="line">    User user =  mapper.getUserById(<span class="number">1</span>);</span><br><span class="line">    System.out.println(user);</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>注解的作用本质：使用反射得到实现类（UserMapper.class）【*】待完善</p>
<p>用到的设计模式：动态代理模式</p>
<p>注意：</p>
<p>对于简单的sql语句，建议使用注解开发，避免了xml</p>
<p>对于复杂的sql语句，建议使用xml，因为注解无法使用resultMap</p>
<h4 id="8-3-Mybatis执行流程"><a href="#8-3-Mybatis执行流程" class="headerlink" title="8.3 Mybatis执行流程"></a>8.3 Mybatis执行流程</h4><p>Mybatis执行流程如下：</p>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/20200623165030775.png" alt="20200623165030775"></p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//重点分析创建流程如下</span></span><br><span class="line"></span><br><span class="line">String resource = <span class="string">&quot;mybatis-config.xml&quot;</span>;</span><br><span class="line">InputStream inputStream = Resources.getResourceAsStream(resource);</span><br><span class="line"><span class="comment">//加载全局配置文件</span></span><br><span class="line"></span><br><span class="line">sqlSessionFactory = <span class="keyword">new</span> SqlSessionFactoryBuilder().build(inputStream);</span><br><span class="line"><span class="comment">//实例化SqlSessionFactoryBuilder构造器并解析配置文件</span></span><br><span class="line"></span><br></pre></td></tr></table></figure>

<p>接下来就是读源码环节：</p>
<blockquote>
<p>首先看build方法干了些什么，核心代码如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">SqlSessionFactory var5;</span><br><span class="line">XMLConfigBuilder parser = <span class="keyword">new</span> XMLConfigBuilder(inputStream, environment, properties);</span><br><span class="line"><span class="comment">//可以看到首先建立了一个XMLConfigBuilder类，这个类的作用就是得到Configuration配置信息</span></span><br><span class="line">var5 = <span class="keyword">this</span>.build(parser.parse());</span><br><span class="line"><span class="comment">//XMLConfigBuilder实例建立了一个Configuration对象，并把这个对象传递给SqlSessionFactory工厂</span></span><br><span class="line"><span class="comment">//相当于工厂具有了Configuration，生产出来的SqlSession都具有Configuration对象，都符合配置要求</span></span><br><span class="line"><span class="keyword">return</span> var5;</span><br></pre></td></tr></table></figure>

<p>这里面最重要的思想是，配置信息通过InputStream，以流的方式传递给了配置对象的生产商（XMLConfigBuilder），生产商生产出来配置对象，这一步把配置信息从文件的形式转成了对象</p>
<p>然后把这个对象传递给SqlSessionFactoryBuilder，Builder把配置对象组装到工厂中，从此工厂生产的SqlSession就都具有了该配置信息</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="title">DefaultSqlSessionFactory</span><span class="params">(Configuration configuration)</span> </span>&#123;</span><br><span class="line">    <span class="keyword">this</span>.configuration = configuration;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
</blockquote>
<p>清楚了build方法，我们再来看工厂是如何生产sqlSession实例的</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">static</span> SqlSession <span class="title">getSqlSession</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = sqlSessionFactory.openSession();</span><br><span class="line">    <span class="keyword">return</span> sqlSession;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>核心是openSession方法</p>
<blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">&gt;<span class="function"><span class="keyword">public</span> SqlSession <span class="title">openSession</span><span class="params">()</span> </span>&#123;</span><br><span class="line">   <span class="keyword">return</span> <span class="keyword">this</span>.openSessionFromDataSource(<span class="keyword">this</span>.configuration.getDefaultExecutorType(), (TransactionIsolationLevel)<span class="keyword">null</span>, <span class="keyword">false</span>);</span><br><span class="line">&gt;&#125;</span><br><span class="line"></span><br><span class="line">&gt;<span class="function"><span class="keyword">public</span> SqlSession <span class="title">openSession</span><span class="params">(<span class="keyword">boolean</span> autoCommit)</span> </span>&#123;</span><br><span class="line">   <span class="keyword">return</span> <span class="keyword">this</span>.openSessionFromDataSource(<span class="keyword">this</span>.configuration.getDefaultExecutorType(), (TransactionIsolationLevel)<span class="keyword">null</span>, autoCommit);</span><br><span class="line">&gt;&#125;</span><br></pre></td></tr></table></figure>

<p>通过源码，我们发现默认情况下，autoCommit是false，也就是说事务的自动提交是关闭的，这也解释了为什么我们需要手动提交（Commit）</p>
</blockquote>
<p>好了，现在我们已经有了SqlSession，拿再来看执行的过程</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line">List&lt;User&gt; user =  mapper.getUserById(<span class="number">1</span>);</span><br></pre></td></tr></table></figure>

<p>我们先通过sqlSession拿到接口的实现类mapper（通过反射实现），然后再调用mapper的方法</p>
<blockquote>
<p>而注解和XML只是Mybatis得到接口的实现类的两种手段而已</p>
</blockquote>
<h4 id="8-4-注解CRUD"><a href="#8-4-注解CRUD" class="headerlink" title="8.4 注解CRUD"></a>8.4 注解CRUD</h4><p>注解方式是可以传递参数的，看下面这个例子</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Select(&quot;select * from user where id = #&#123;uid&#125; and name = #&#123;uname&#125;&quot;)</span></span><br><span class="line"><span class="function">User <span class="title">getUserByIdName</span><span class="params">(<span class="meta">@Param(&quot;uid&quot;)</span> <span class="keyword">int</span> id,<span class="meta">@Param(&quot;uname&quot;)</span> String name)</span></span>;</span><br></pre></td></tr></table></figure>

<p>关于@Param()注解</p>
<ul>
<li><p><strong>作用：给属性起别名</strong></p>
</li>
<li><p>基本类型的参数或者String类型，需要加上</p>
</li>
<li><p>引用类型也要加，格式为 <strong>@Param(value = “u”)</strong> 双引号中间为引用类型在sql中的名字，通过 . 调用其方法</p>
</li>
<li><p>如果只有一个基本类型的话，可以忽略，但是建议加上（只有一个引用类型，也可以加或不加）</p>
</li>
<li><p>==我们在SQL中引用的就是我们这里的@Param()中设定的属性名==</p>
</li>
</ul>
<p><strong>这个注解完美的解决了多参数问题，还可以为参数起名</strong></p>
<p>==终极版==</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Select(&quot;select * from user where id = #&#123;u.id&#125; and name = #&#123;u.name&#125;&quot;)</span></span><br><span class="line"><span class="function">User <span class="title">getUserByIdName</span><span class="params">(<span class="meta">@Param(&quot;uid&quot;)</span> <span class="keyword">int</span> id,<span class="meta">@Param(&quot;uname&quot;)</span> String name,<span class="meta">@Param(value = &quot;u&quot;)</span> User user)</span></span>;</span><br></pre></td></tr></table></figure>

<blockquote>
<p>如果是单一参数，没必要用@Param，你在sql中随便起什么名都行</p>
</blockquote>
<blockquote>
<p>如果是多个基本参数，必须加上？</p>
</blockquote>
<blockquote>
<p>如果参数是Bean，直接在sql中引用属性名即可，当然也可以通过注解给对象起别名，然后#{u.pwd}</p>
</blockquote>
<p>==增删改==</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//增</span></span><br><span class="line"><span class="meta">@Insert(&quot;insert into user(id,name,pwd) values(#&#123;id&#125;,#&#123;name&#125;,#&#123;password&#125;)&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">addUser</span><span class="params">(User user)</span></span>;</span><br><span class="line"><span class="comment">//改</span></span><br><span class="line"><span class="meta">@Update(&quot;update user set name=#&#123;name&#125;,pwd=#&#123;password&#125; where id = #&#123;id&#125;&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">updateUser</span><span class="params">(User user)</span></span>;</span><br><span class="line"><span class="comment">//删</span></span><br><span class="line"><span class="meta">@Delete(&quot;delete from user where id = #&#123;uid&#125;&quot;)</span></span><br><span class="line"><span class="function"><span class="keyword">int</span> <span class="title">deleteUser</span><span class="params">(<span class="meta">@Param(&quot;uid&quot;)</span><span class="keyword">int</span> id)</span></span>;</span><br></pre></td></tr></table></figure>



<blockquote>
<p>关于取参数的 #{ } 和 ${ }</p>
<p>#{ } 安全，可以在很大程度上防止sql注入 【相当于PreparedStatement，预编译】</p>
<p>${ } 不安全【直接连接的，容易被拼接导致sql注入】</p>
</blockquote>
<h3 id="九、LOMBOK"><a href="#九、LOMBOK" class="headerlink" title="九、LOMBOK"></a>九、LOMBOK</h3><blockquote>
<p>场景：</p>
<p>我们每新建一个实体类，就要写一大堆的get、set方法，hashcode方法等</p>
<p>LOMBOK应运而生</p>
</blockquote>
<p>LOMBOK的意义就是简化复杂的繁杂的实体类代码</p>
<p>使用步骤：</p>
<ol>
<li>在IDEA中安装LOMBOK插件【新版IDEA已捆绑，就不需要安装了】</li>
<li>在项目中导入LOMBOK的jar包</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!-- https://mvnrepository.com/artifact/org.projectlombok/lombok --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.projectlombok<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>lombok<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.18.22<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">scope</span>&gt;</span>provided<span class="tag">&lt;/<span class="name">scope</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="3">
<li>在实体类上加注解，注解的作用范围可以是类级别的，也可以是单个属性</li>
</ol>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br></pre></td><td class="code"><pre><span class="line">@Getter and @Setter  生成get、set方法</span><br><span class="line">@FieldNameConstants</span><br><span class="line">@ToString  生成toString方法</span><br><span class="line">@EqualsAndHashCode</span><br><span class="line">@AllArgsConstructor  生成有参构造</span><br><span class="line">@RequiredArgsConstructor </span><br><span class="line">@NoArgsConstructor  生成无参构造</span><br><span class="line">@Log, @Log4j, @Log4j2, @Slf4j, @XSlf4j, @CommonsLog, @JBossLog, @Flogger, @CustomLog</span><br><span class="line">@Data</span><br><span class="line">@Builder</span><br><span class="line">@SuperBuilder</span><br><span class="line">@Singular</span><br><span class="line">@Delegate</span><br><span class="line">@Value</span><br><span class="line">@Accessors</span><br><span class="line">@Wither</span><br><span class="line">@With</span><br><span class="line">@SneakyThrows</span><br><span class="line">@val</span><br></pre></td></tr></table></figure>



<h3 id="十、详解ResultMap"><a href="#十、详解ResultMap" class="headerlink" title="十、详解ResultMap"></a>十、详解ResultMap</h3><blockquote>
<p>参考文章：<a target="_blank" rel="noopener" href="https://blog.csdn.net/bear_wr/article/details/52383840?%3E">ResultMap详解</a></p>
</blockquote>
<p>ResultMap是整个Mybatis中最核心最重要的东西，也是Mybatis能省略很多JDBC代码的核心秘诀，ResultMap可以自动推断【例如只有一个参数时，无需指定类型】</p>
<blockquote>
<p>先从select语句开始吧，这里分析4个最常用的属性</p>
<table>
<thead>
<tr>
<th align="left">属性</th>
<th align="left">描述</th>
</tr>
</thead>
<tbody><tr>
<td align="left"><code>id</code></td>
<td align="left">在命名空间中唯一的标识符，可以被用来引用这条语句。id应当与Mapper接口中的对应方法名保持一致，这样才能通过SqlSession.getMapper将两者联系起来</td>
</tr>
<tr>
<td align="left"><code>parameterType</code></td>
<td align="left">将会传入这条语句的参数的类全限定名或别名。<strong>这个属性是可选的，因为 MyBatis 可以通过类型处理器（TypeHandler）推断出具体传入语句的参数</strong>，默认值为未设置（unset）。</td>
</tr>
<tr>
<td align="left"><code>resultType</code></td>
<td align="left">期望从这条语句中返回结果的类全限定名或别名。 注意，<strong>如果返回的是集合，那应该设置为集合包含的类型，而不是集合本身的类型</strong>。 Mybatis同样可以根据Mapper接口推断出是否是集合以及集合的类型，resultType 和 resultMap 之间只能同时使用一个。</td>
</tr>
<tr>
<td align="left"><code>resultMap</code></td>
<td align="left">对外部 resultMap 的命名引用。结果映射是 MyBatis 最强大的特性，如果你对其理解透彻，许多复杂的映射问题都能迎刃而解。 resultType 和 resultMap 之间只能同时使用一个。</td>
</tr>
</tbody></table>
</blockquote>
<h4 id="10-1-起步"><a href="#10-1-起步" class="headerlink" title="10.1 起步"></a>10.1 起步</h4><blockquote>
<p>关于resultType，resultType通常指向Bean类，然而······</p>
<p>mybatis是真滴牛皮，经过试验，private属性，没有set方法，只有get方法都能给你拿出来</p>
</blockquote>
<h5 id="A：ResultType"><a href="#A：ResultType" class="headerlink" title="A：ResultType"></a>A：ResultType</h5><p>只有Select语句才有ResultType属性，这个属性指明了期望从这条语句中<strong>返回结果的类</strong>全限定名或别名【或者是集合，此时只需指明集合中的泛型即可】</p>
<blockquote>
<p>即ResultType一定是一个已经存在的类，Mybatis会自动把数据库字段的值赋给对象的属性</p>
</blockquote>
<p>【ResultType】的工作方式：</p>
<p>见ResultMap    B.3节结尾分析</p>
<h5 id="B：ResultMap"><a href="#B：ResultMap" class="headerlink" title="B：ResultMap"></a>B：ResultMap</h5><p>通常情况下，ResultMap的结构会类似如下形式：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;&quot;</span> <span class="attr">type</span>=<span class="string">&quot;&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;&quot;</span> <span class="attr">column</span>=<span class="string">&quot;&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">association</span> <span class="attr">property</span>=<span class="string">&quot;&quot;</span> <span class="attr">javaType</span>=<span class="string">&quot;&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">association</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">collection</span> <span class="attr">property</span>=<span class="string">&quot;&quot;</span> <span class="attr">ofType</span>=<span class="string">&quot;&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">collection</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>我们先来研究一下ResultMap属性，再来研究其内部标签</p>
<p><strong>B.1 ResultMap属性</strong></p>
<table>
<thead>
<tr>
<th align="left">属性</th>
<th align="left">描述</th>
</tr>
</thead>
<tbody><tr>
<td align="left"><code>id</code></td>
<td align="left">当前命名空间中的一个唯一标识，用于标识一个结果映射。应当与sql标签中的ResultMap属性保持一致</td>
</tr>
<tr>
<td align="left"><code>type</code></td>
<td align="left">类的完全限定名, 或者一个类型别名（关于内置的类型别名，可以参考上面的表格）。</td>
</tr>
</tbody></table>
<p><strong>注意：ResultMap返回的结果也将是一个类，所以根本就无需考虑返回基本类型这种情况</strong></p>
<p><strong>B.2 ResultMap字段</strong></p>
<ul>
<li><p><code>id</code>  和<code>result</code>作用相同，一般主键用id即可</p>
</li>
<li><p><code>result</code>  注入到字段或 JavaBean 属性的普通结果</p>
</li>
<li><p><code>association</code> 一个复杂类型的关联；许多结果将包装成这种类型</p>
<ul>
<li>嵌套结果映射 – 关联可以是 <code>resultMap</code> 元素，或是对其它结果映射的引用</li>
</ul>
</li>
<li><p><code>collection</code> 一个复杂类型的集合</p>
<ul>
<li>嵌套结果映射 – 集合可以是 <code>resultMap</code> 元素，或是对其它结果映射的引用</li>
</ul>
</li>
</ul>
<p>ID和Result字段属性详解</p>
<table>
<thead>
<tr>
<th align="left">属性</th>
<th align="left">描述</th>
</tr>
</thead>
<tbody><tr>
<td align="left"><code>property</code></td>
<td align="left">映射到列结果的字段或属性。如果 JavaBean 有这个名字的属性（property），会先使用该属性。否则 MyBatis 将会寻找给定名称的字段（field）。</td>
</tr>
<tr>
<td align="left"><code>column</code></td>
<td align="left">数据库中的列名，或者是列的别名。</td>
</tr>
<tr>
<td align="left"><code>javaType</code></td>
<td align="left">一个 Java 类的完全限定名，或一个类型别名（关于内置的类型别名，可以参考上面的表格）。 如果你映射到一个 JavaBean，MyBatis 通常可以推断类型。然而，如果你映射到的是 HashMap，那么你应该明确地指定 javaType 来保证行为与期望的相一致。</td>
</tr>
</tbody></table>
<p><strong>对于Bean和数据库名称一样的字段，可以省略不写Result</strong></p>
<p><strong>B.3 ResultMap作用过程</strong></p>
<p> 在更进一步之前，我们来看看Mybatis是怎样从SQL查询结果到生成Bean对象的</p>
<blockquote>
<ol>
<li>通过JDBC查询得到ResultSet对象</li>
<li>遍历ResultSet对象并将每行数据暂存到HashMap实例中，以结果集的字段名或字段别名为键，以字段值为值</li>
<li><strong>根据ResultMap标签的type属性通过反射实例化领域模型</strong></li>
<li>根据ResultMap标签id、result等标签信息将HashMap中的键值对，填充到领域模型实例中并返回</li>
</ol>
<p>由以上过程，我们可以知晓：</p>
<p>ResultSet的一行记录就对应一个HashMap对象，其中ResultSet的字段名是HashMap的键名，字段名的值就是HashMap的值</p>
<p>然后通过反射生成一个Bean对象，再把HashMap给映射到Bean对象上</p>
</blockquote>
<p>那么ResultMap是如何作用的呢</p>
<blockquote>
<p>一个简单的例子如下：</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span></span>&#123;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">long</span> id;</span><br><span class="line">  <span class="keyword">private</span> String name;</span><br><span class="line">  <span class="keyword">private</span> <span class="keyword">int</span> age;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getStudent&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;getStudentRM&quot;</span>&gt;</span></span><br><span class="line">  SELECT ID, Name, Age</span><br><span class="line">    FROM TStudent</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;getStudentRM&quot;</span> <span class="attr">type</span>=<span class="string">&quot;Studnet&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">id</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;ID&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;studentName&quot;</span> <span class="attr">column</span>=<span class="string">&quot;Name&quot;</span>/&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;studentAge&quot;</span> <span class="attr">column</span>=<span class="string">&quot;Age&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>首先是JDBC，Mybatis先把数据库结果查出来放到ResultSet中，再把ResultSey结果集转化为HashMap对象集合。然后Mybatis根据resultMap的type属性，通过反射生成Student对象，再借助自身的result标签，指明HashMap和Bean的对应关系，完成映射</p>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/%E6%9C%AA%E5%91%BD%E5%90%8D%E8%A1%A8%E5%8D%95.png" alt="未命名表单"></p>
<p><strong>注：如果在sql中起别名了，那么hashMap的键就是别名，而不是数据库中原字段的名字</strong></p>
</blockquote>
<p>通过以上流程我们就能明白为什么当数据库的字段名和指定的返回Bean类属性名不同时，无法赋值了，核心就是<code>通过键名匹配</code></p>
<blockquote>
<p>插曲：</p>
<p>经验证一个没有任何方法的类，都可以被正确映射，其原因是Mybatis通过反射生成Bean对象</p>
<ul>
<li>反射生成Bean对象牛逼的地方在于，完全可以跳过sette方法或者构造函数，直接就改类的属性</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//通过反射获取反射对象</span></span><br><span class="line">Class&lt;?&gt; name1 = Class.forName(str);</span><br><span class="line"><span class="comment">//通过反射获取某个声明的属性</span></span><br><span class="line">Field declaredField = name1.getDeclaredField(<span class="string">&quot;name&quot;</span>);</span><br><span class="line"><span class="comment">//一般属性私有化，通过setAccessible方法，可以免去安全访问环节，对象可以直接访问。</span></span><br><span class="line">declaredField.setAccessible(<span class="keyword">true</span>);</span><br><span class="line"><span class="comment">//通过set方法，修改属性，里面的参数是实例对象和修改后的参数。</span></span><br><span class="line">declaredField.set(instance, <span class="string">&quot;gaoqi&quot;</span>);</span><br></pre></td></tr></table></figure>

<p>至此我们就明白了为何Bean类仅仅有属性就可以做到被ResultMap映射了。</p>
</blockquote>
<p>说了这么多，我们要明白ResultMap本质就是一个映射表，其本身不存储数据，而是建立起了HashMap和Bean的桥梁，而ResultType指定Bean，就是采取默认映射方式（认为Bean属性名=数据库字段名），其背后也是ResultMap</p>
<p>还有一点要注意，通过以上分析过程我们也明白了，Bean类不一定是非要和数据库对应的类，只要字段能对应上即可</p>
<h4 id="10-2-ResultMap复杂查询详解"><a href="#10-2-ResultMap复杂查询详解" class="headerlink" title="10.2 ResultMap复杂查询详解"></a>10.2 ResultMap复杂查询详解</h4><h5 id="A：多对一问题"><a href="#A：多对一问题" class="headerlink" title="A：多对一问题"></a><strong>A：多对一问题</strong></h5><p><strong>1 . 测试环境搭建</strong></p>
<ol>
<li>导入lombok</li>
<li>新建实体类Teacher,Student</li>
<li>建立Mapper接口</li>
<li>建立Mapper.xml文件</li>
<li>在核心配置文件中绑定注册我们的Mapper接口或者文件</li>
<li>测试查询是否能够成功</li>
</ol>
<blockquote>
<p>一些注意点：</p>
<ul>
<li>把核心配置文件中的Config、Configuration换成Mapper就得到了Mapper.xml，记得同步大小写</li>
<li>建议把Mapper.xml放在Resources中，但是应当与java建立同样的包层级结构，这样构建时会合并</li>
</ul>
</blockquote>
<p><strong>2 . 问题详解</strong> </p>
<blockquote>
<p>问题描述：</p>
<p>Student Bean 内组合了一个Teacher对象，如何映射？</p>
<p>sql语句是可以两表查询的，但现在问题是如何把另一个表中的内容映射到Student bean的Teacher对象中</p>
</blockquote>
<p>首先：我们要用ResultMap作为映射集，普通的类型可以用Result标签，复杂类型（即Bean中的另一个Bean对象）用Association标签</p>
<p><strong>方式一：按照查询嵌套（子查询法）</strong></p>
<p>思路：</p>
<p>我们可以先把student的属性标记出来，teacher是另一个bean对象，所以用association标签</p>
<p>但这个对象还有其自己的属性，该怎么办呢？</p>
<p>直接拿着tid属性去找不就好了，所以我们在association标签中再设置一个select属性，也即再做一次查询，属性的值就是另一个查询方法名，Mybatis找到这个方法后，一查，得到一个teacher Bean，再把这个bean返回给student的teacher字段，完事！</p>
<p>用这种方法时，association的column属性值，就是数据库中student表可以拿着去查其他表的那个字段！<strong>（即第二次查询的参数）</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getStudent&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;StudentTeacher&quot;</span>&gt;</span></span><br><span class="line">	select * from student</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;StudentTeacher&quot;</span> <span class="attr">type</span>=<span class="string">&quot;Student&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span> <span class="attr">column</span>=<span class="string">&quot;name&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!-- 复杂类型用association标签 --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">association</span> <span class="attr">property</span>=<span class="string">&quot;teacher&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tid&quot;</span>  <span class="attr">select</span>=<span class="string">&quot;getTeacher&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getTeacher&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Teacher&quot;</span>&gt;</span></span><br><span class="line">	select * from teacher where id=#&#123;id&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>方式二：按照结果嵌套（联表查询法）</strong></p>
<p>思路：</p>
<p>上面的两次查询显得有些不自然，能不能只用一条SQL呢？</p>
<p>当然可以！前面我们提到过Mybatis的Sql是可以一次查两张表的</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> s.id sid, s.name sname, tid, t.name tname, t.id tid</span><br><span class="line"><span class="keyword">from</span> student s, teacher t</span><br><span class="line"><span class="keyword">where</span> s.tid <span class="operator">=</span> t.id</span><br></pre></td></tr></table></figure>

<p>现在这条sql的结果是一张表</p>
<img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211128162200921.png" alt="image-20211128162200921" style="zoom:50%;">

<p>其实，这张表已经很清晰了，一条记录就是一个Student Bean</p>
<p>而表中的tname、tid直接呈现的，Bean中这两个字段是作为teacher对象存在的，问题就来了：怎么把tname和tid给弄到teacher对象中呢？</p>
<p>很简单，我们显示的声明就好了，我们直接在resultMap映射集中告诉Mybatis：我的teacher是个对象，它有两个字段，你查完数据库得到resultSet后，记得把这俩字段的值塞给teacher对象！</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;ttt&quot;</span> <span class="attr">type</span>=<span class="string">&quot;Student&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span> <span class="attr">column</span>=<span class="string">&quot;sname&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;sid&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">association</span> <span class="attr">property</span>=<span class="string">&quot;teacher&quot;</span> <span class="attr">javaType</span>=<span class="string">&quot;Teacher&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tname&quot;</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tid&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">association</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getStudent2&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;ttt&quot;</span>&gt;</span></span><br><span class="line">    select s.id sid, s.name sname, t.name tname, t.id tid</span><br><span class="line">    from student s, teacher t</span><br><span class="line">    where s.tid = t.id</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>注：我们的Student Bean中没有tid这一属性！</p>
<p><strong>Association属性详解：</strong></p>
<table>
<thead>
<tr>
<th>属性</th>
<th>描述</th>
</tr>
</thead>
<tbody><tr>
<td><code>javaType</code></td>
<td>一个 Java 类的完全限定名，或一个类型别名（关于内置的类型别名，可以参考上面的表格）。 如果你映射到一个 JavaBean，MyBatis <strong>通常可以推断类型</strong>。然而，如果你映射到的是 HashMap，那么你应该明确地指定 javaType 来保证行为与期望的相一致。</td>
</tr>
</tbody></table>
<p><strong>Association标签和Result标签本质一样，都是映射工具，只不过Association用来映射复杂类型</strong></p>
<h5 id="B：一对多问题"><a href="#B：一对多问题" class="headerlink" title="B：一对多问题"></a><strong>B：一对多问题</strong></h5><ol>
<li><strong>环境搭建：</strong></li>
</ol>
<p>更新Teacher类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Teacher</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> List&lt;Student&gt; students;</span><br><span class="line">    <span class="comment">//该字段描述所有老师是该老师的学生们</span></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>更新Student类</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">Student</span> </span>&#123;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> id;</span><br><span class="line">    <span class="keyword">private</span> String name;</span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">int</span> tid;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ol start="2">
<li><strong>问题描述：</strong></li>
</ol>
<p>怎样根据老师的id号，得到该老师对象呢？</p>
<p><strong>方法一：按照结果嵌套</strong></p>
<blockquote>
<p>按照结果嵌套的思路是最直观的，即拿到所有需要的字段，然后通过ResultMap组装成Bean</p>
</blockquote>
<p>分析：</p>
<p>结果是哪个bean——Teacher Bean</p>
<p>Teacher Bean有哪些属性—— id、name、students集合</p>
<p>students集合中的student有哪些属性——id、name、tid</p>
<p>所以我们一共需要哪些字段——tname、tid、sname、sid</p>
<p>ok，想明白了需要哪些字段，我们来写SQL</p>
<figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> s.id sid, s.name sname, t.name tname, t.id tid</span><br><span class="line"><span class="keyword">from</span> student s, teacher t</span><br><span class="line"><span class="keyword">where</span> s.tid <span class="operator">=</span> t.id</span><br></pre></td></tr></table></figure>

<p>sql有了，我们怎么组装呢？</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;TeacherStudent&quot;</span> <span class="attr">type</span>=<span class="string">&quot;Teacher&quot;</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 普通对象，普通组装 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tid&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tname&quot;</span>/&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 集合，用collection 集合中的泛型用ofType指明--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!-- 集合标签就是告诉Mybatis，把老师的id相同的Student记录给合并，都放到这里 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">collection</span> <span class="attr">property</span>=<span class="string">&quot;students&quot;</span> <span class="attr">ofType</span>=<span class="string">&quot;Student&quot;</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!-- 集合泛型中有哪些字段呢，一一映射就好了 --&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;sid&quot;</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;name&quot;</span> <span class="attr">column</span>=<span class="string">&quot;sname&quot;</span>/&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;tid&quot;</span> <span class="attr">column</span>=<span class="string">&quot;tid&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">collection</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>注：ofType不要省略！</strong></p>
<p><strong>再把老师的id条件一加，完美</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getTeacher&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;TeacherStudent&quot;</span>&gt;</span></span><br><span class="line">    select s.id sid, s.name sname, t.name tname, t.id tid</span><br><span class="line">    from student s, teacher t</span><br><span class="line">    where s.tid = t.id and t.id = 1;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p><strong>方法二：按照查询嵌套</strong></p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getTeacher2&quot;</span> <span class="attr">resultMap</span>=<span class="string">&quot;TeacherStudent2&quot;</span>&gt;</span></span><br><span class="line">    select * from teacher where id = #&#123;id&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">resultMap</span> <span class="attr">id</span>=<span class="string">&quot;TeacherStudent2&quot;</span> <span class="attr">type</span>=<span class="string">&quot;Teacher&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">result</span> <span class="attr">property</span>=<span class="string">&quot;id&quot;</span> <span class="attr">column</span>=<span class="string">&quot;id&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">collection</span> <span class="attr">property</span>=<span class="string">&quot;students&quot;</span>  <span class="attr">javaType</span>=<span class="string">&quot;ArrayList&quot;</span> <span class="attr">ofType</span>=<span class="string">&quot;Student&quot;</span> <span class="attr">select</span>=<span class="string">&quot;getStudents&quot;</span> <span class="attr">column</span>=<span class="string">&quot;id&quot;</span>/&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">resultMap</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;getStudents&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Student&quot;</span>&gt;</span></span><br><span class="line">    select * from student where tid = #&#123;tid&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>子查询就是ResultMap我不动，我只声明students是个集合，泛型是Student，参数字段是id，你拿着id再去查，查完了直接给我，即不关心Student里究竟有什么</p>
<p><strong>注：关于Collections的javaType和ofType</strong></p>
<ul>
<li><p>javaType说明的是Bean属性本身是什么类型，如果是集合，就是集合本身的类型，如ArrayList，而ofType说明的是泛型是什么</p>
</li>
<li><p>前者可以省略，后者不可以省略</p>
</li>
</ul>
<p>一些感悟：写ResultMap的时候，就想成数据库中一条记录和一个Bean的对应情况，Mybatis会自动把所有记录按照这种规则生成许多Bean的</p>
<h3 id="十一、动态SQL"><a href="#十一、动态SQL" class="headerlink" title="十一、动态SQL"></a>十一、动态SQL</h3><blockquote>
<p>通过把关键字设置为标签解决了拼接sql语句多余的逗号，多余的and/or，以及缺少空格等种种情况</p>
</blockquote>
<p>动态SQL：根据不同的条件生成不同的SQL语句</p>
<ul>
<li>if</li>
<li>choose (when, otherwise)</li>
<li>trim (where, set)</li>
<li>foreach</li>
</ul>
<h4 id="11-1-if"><a href="#11-1-if" class="headerlink" title="11.1 if"></a>11.1 if</h4><p>对于map参数，检测是否有key “title”，如果有，其value是否为空</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;queryBlogIf&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Blog&quot;</span>&gt;</span></span><br><span class="line">    select * from blog where 1=1</span><br><span class="line">    <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;title!=null&quot;</span>&gt;</span></span><br><span class="line">        and title = #&#123;title&#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;author!=null&quot;</span>&gt;</span></span><br><span class="line">        and author = #&#123;author&#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>如果不指明parameterType，则</p>
<ul>
<li><p>参数是Bean对象，直接调用其属性</p>
</li>
<li><p>接口通过注解指明了参数名</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="function">List&lt;Blog&gt; <span class="title">queryBlogIF</span><span class="params">(<span class="meta">@Param(&quot;title&quot;)</span> String title,<span class="meta">@Param(&quot;author&quot;)</span> String author)</span></span>;</span><br></pre></td></tr></table></figure></li>
</ul>
<h4 id="11-2-choose-when-otherwise"><a href="#11-2-choose-when-otherwise" class="headerlink" title="11.2 choose,when,otherwise"></a>11.2 choose,when,otherwise</h4><p>where元素只会在至少有一个子元素的条件下向sql中插入where关键字，并且若语句的开头为and或or，where会将它们去除</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;queryBlogIf&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Blog&quot;</span>&gt;</span></span><br><span class="line">    select * from blog</span><br><span class="line">    <span class="tag">&lt;<span class="name">where</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;title!=null&quot;</span>&gt;</span></span><br><span class="line">            and title = #&#123;title&#125;</span><br><span class="line">        <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;author!=null&quot;</span>&gt;</span></span><br><span class="line">            and author = #&#123;author&#125;</span><br><span class="line">        <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>choose-when-otherwise，类似java中的switch-case-default，只不过choose只会选择一个实现，当满足一个条件后，就直接跳出了</p>
<p>测试用例如下：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;queryBlogChoose&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Blog&quot;</span>&gt;</span></span><br><span class="line">    select * from blog</span><br><span class="line">    <span class="tag">&lt;<span class="name">where</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">choose</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">when</span> <span class="attr">test</span>=<span class="string">&quot;title != null&quot;</span>&gt;</span></span><br><span class="line">                title = #&#123;title&#125;</span><br><span class="line">            <span class="tag">&lt;/<span class="name">when</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">when</span> <span class="attr">test</span>=<span class="string">&quot;author != null&quot;</span>&gt;</span></span><br><span class="line">                and author = #&#123;author&#125;</span><br><span class="line">            <span class="tag">&lt;/<span class="name">when</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">otherwise</span>&gt;</span></span><br><span class="line">                views = #&#123;views&#125;</span><br><span class="line">            <span class="tag">&lt;/<span class="name">otherwise</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">choose</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">queryBlogChoose</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    BlogMapper mapper = sqlSession.getMapper(BlogMapper.class);</span><br><span class="line">    Map map = <span class="keyword">new</span> HashMap();</span><br><span class="line">    </span><br><span class="line">    map.put(<span class="string">&quot;title&quot;</span>,<span class="string">&quot;Java&quot;</span>);</span><br><span class="line">    map.put(<span class="string">&quot;author&quot;</span>,<span class="string">&quot;狂神说&quot;</span>);</span><br><span class="line">    map.put(<span class="string">&quot;views&quot;</span>,<span class="number">9999</span>);</span><br><span class="line">    </span><br><span class="line">    List&lt;Blog&gt; blogList = mapper.queryBlogChoose(map);</span><br><span class="line">    <span class="keyword">for</span> (Blog blog : blogList) &#123;</span><br><span class="line">        System.out.println(blog);</span><br><span class="line">    &#125;</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>以上无论如何修改author和views，结果都不会变，因为第一条满足后，sql语句就直接跳出了choose标签</p>
<h4 id="11-3-set-where-trim"><a href="#11-3-set-where-trim" class="headerlink" title="11.3 set where trim"></a>11.3 set where trim</h4><p>set标签，只有当标签内最少有一个元素时，才会在sql语句结尾添加set关键字</p>
<p>测试用例如下：</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">update</span> <span class="attr">id</span>=<span class="string">&quot;updateBlog&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span>&gt;</span></span><br><span class="line">    update blog</span><br><span class="line">    <span class="tag">&lt;<span class="name">set</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;title !=null&quot;</span>&gt;</span></span><br><span class="line">            title = #&#123;title&#125;,</span><br><span class="line">        <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;author !=null&quot;</span>&gt;</span></span><br><span class="line">            author = #&#123;author&#125;,</span><br><span class="line">        <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">set</span>&gt;</span></span><br><span class="line">    where id = #&#123;id&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">update</span>&gt;</span></span><br></pre></td></tr></table></figure>



<p><code>where 可以去除多余的前置and/or 因为这俩伴随着where子句</code></p>
<p><code>set 可以去除多余的后置 ，因为逗号伴随着set 常见于update语句中</code></p>
<p>关于trim</p>
<p>【待完善*】</p>
<p><a target="_blank" rel="noopener" href="https://blog.csdn.net/wt_better/article/details/80992014">(33条消息) mybatis trim标签的使用_wt_better的博客-CSDN博客_mybatis trim</a></p>
<h4 id="11-4-foreach"><a href="#11-4-foreach" class="headerlink" title="11.4 foreach"></a>11.4 foreach</h4><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">select</span> <span class="operator">*</span> <span class="keyword">from</span> blog <span class="keyword">where</span> (id<span class="operator">=</span><span class="number">1</span> <span class="keyword">or</span> id<span class="operator">=</span><span class="number">2</span> <span class="keyword">or</span> id<span class="operator">=</span><span class="number">3</span>)</span><br></pre></td></tr></table></figure>

<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;queryBlogEach&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;Blog&quot;</span>&gt;</span></span><br><span class="line">    select * from blog</span><br><span class="line">    <span class="tag">&lt;<span class="name">where</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">foreach</span> <span class="attr">collection</span>=<span class="string">&quot;ids&quot;</span> <span class="attr">item</span>=<span class="string">&quot;tid&quot;</span> <span class="attr">open</span>=<span class="string">&quot;(&quot;</span> <span class="attr">close</span>=<span class="string">&quot;)&quot;</span> <span class="attr">separator</span>=<span class="string">&quot;or&quot;</span>&gt;</span></span><br><span class="line">            id = #&#123;tid&#125;</span><br><span class="line">        <span class="tag">&lt;/<span class="name">foreach</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">where</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br></pre></td></tr></table></figure>

<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">List&lt;String&gt; list = <span class="keyword">new</span> ArrayList&lt;&gt;();</span><br><span class="line">list.add(<span class="string">&quot;1&quot;</span>);</span><br><span class="line">list.add(<span class="string">&quot;2&quot;</span>);</span><br><span class="line">list.add(<span class="string">&quot;3&quot;</span>);</span><br><span class="line">map.put(<span class="string">&quot;ids&quot;</span>,list);</span><br><span class="line">List&lt;Blog&gt; blogList = mapper.queryBlogEach(map);</span><br></pre></td></tr></table></figure>

<p><code>foreach的用法</code></p>
<p>collections就是map中的参数名</p>
<p>tid就是每一项的参数名</p>
<p>open，close就是开头和结尾额外附加的（此例中可以省略）</p>
<p>separator就是分割符</p>
<h4 id="11-5-SQL片段"><a href="#11-5-SQL片段" class="headerlink" title="11.5 SQL片段"></a>11.5 SQL片段</h4><p>使用sql标签抽取公共部分</p>
<p>在需要使用的地方使用include标签引用</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">sql</span> <span class="attr">id</span>=<span class="string">&quot;if-title-author&quot;</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;title !=null&quot;</span>&gt;</span></span><br><span class="line">        title = #&#123;title&#125;,</span><br><span class="line">    <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">if</span> <span class="attr">test</span>=<span class="string">&quot;author !=null&quot;</span>&gt;</span></span><br><span class="line">        author = #&#123;author&#125;,</span><br><span class="line">    <span class="tag">&lt;/<span class="name">if</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">sql</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">update</span> <span class="attr">id</span>=<span class="string">&quot;updateBlog&quot;</span> <span class="attr">parameterType</span>=<span class="string">&quot;map&quot;</span>&gt;</span></span><br><span class="line">    update blog</span><br><span class="line">    <span class="tag">&lt;<span class="name">set</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">include</span> <span class="attr">refid</span>=<span class="string">&quot;if-title-author&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">set</span>&gt;</span></span><br><span class="line">    where id = #&#123;id&#125;</span><br><span class="line"><span class="tag">&lt;/<span class="name">update</span>&gt;</span></span><br></pre></td></tr></table></figure>

<p>注意：</p>
<ul>
<li><p>基于单表来定义SQL片段</p>
</li>
<li><p>不要存在where，set标签</p>
</li>
</ul>
<h3 id="十二、缓存"><a href="#十二、缓存" class="headerlink" title="十二、缓存"></a>十二、缓存</h3><p>数据库解决高并发问题的尝试</p>
<ul>
<li><p>添加Memecache服务器，使得读写分离</p>
</li>
<li><p>使用主从复制技术，多个服务器，有的专用来读，有的用来写（读服务器会设置一个哨兵，当服务器被写入新数据时，及时更新）</p>
</li>
</ul>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211129093726492.png" alt="image-20211129093726492"></p>
<h4 id="12-1-缓存介绍"><a href="#12-1-缓存介绍" class="headerlink" title="12.1 缓存介绍"></a>12.1 缓存介绍</h4><blockquote>
<p>查询需要连接数据库，而连接数据库很费资源</p>
<p>能否把一次查询的结果暂存在可以直接取到的地方，能放在哪呢</p>
<p>可以先放在内存中，将来直接去内存中的位置查找</p>
<p><strong>这个存放在内存中的数据区域就叫做缓存</strong></p>
</blockquote>
<p>什么是缓存[Cache]？</p>
<ol>
<li><p>存在内存中的临时数据</p>
</li>
<li><p>将用户经常查询的数据放在缓存（内存）中，用户去查询数据就不用从磁盘上（关系型数据库文件）查询，从缓存中查询，从而提高查询效率，解决了高并发系统的性能问题</p>
</li>
</ol>
<p>为什么使用缓存？</p>
<ul>
<li>减少和数据库的交互次数，减少系统开销，提高系统效率</li>
</ul>
<p>什么样的数据可以使用缓存？</p>
<ul>
<li>经常查询并且不经常改变的数据 【可以使用缓存】</li>
</ul>
<p>什么样的数据不可以使用缓存</p>
<ul>
<li>不经常查询，且经常修改的数据</li>
</ul>
<h4 id="12-2-Mybatis缓存"><a href="#12-2-Mybatis缓存" class="headerlink" title="12.2 Mybatis缓存"></a>12.2 Mybatis缓存</h4><p>MyBatis包含一个非常强大的查询缓存特性，它可以非常方便的定制和配置缓存，缓存可以极大的提高查询效率。</p>
<p>MyBatis系统中默认定义了两级缓存：<strong>一级缓存和二级缓存</strong></p>
<blockquote>
<p>默认情况下，只有一级缓存开启（SqlSession级别的缓存，也称为本地缓存）</p>
</blockquote>
<ul>
<li><p>二级缓存需要手动开启和配置，他是基于namespace级别的缓存。</p>
</li>
<li><p>为了提高可扩展性，MyBatis定义了缓存接口Cache。我们可以通过实现Cache接口来定义二级缓存。</p>
</li>
</ul>
<h4 id="12-3-一级缓存（本地缓存）"><a href="#12-3-一级缓存（本地缓存）" class="headerlink" title="12.3 一级缓存（本地缓存）"></a>12.3 一级缓存（本地缓存）</h4><ul>
<li>一级缓存也叫本地缓存：SqlSession级别的缓存<ul>
<li>与数据库同一次会话期间查询到的数据会放在本地缓存中</li>
<li>以后如果需要获取相同的数据，直接从缓存中拿，没必要再去查询数据库</li>
</ul>
</li>
</ul>
<p>测试步骤：</p>
<ol>
<li>开启日志</li>
<li>测试在一个Session中查询两次相同记录</li>
<li>查看日志输出</li>
</ol>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211129145606095.png" alt="image-20211129145606095"></p>
<p>用System.currentTimeMillis方法标记，得到两次查询用时分别为1401毫秒和0毫秒，也正如图中所示，第一次查了数据库，第二次直接查缓存</p>
<blockquote>
<p>上面红框中return connection to pool就表示一个数据库的访问连接关闭了，但是Mybatis是关闭sqlSession的同时自动关闭数据库，所以就意味着sqlSession关闭</p>
<p>但是红框中开启JDBC不能代表开启了sqlSession</p>
</blockquote>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession = MybatisUtils.getSqlSession();</span><br><span class="line">    UserMapper mapper = sqlSession.getMapper(UserMapper.class);</span><br><span class="line">    User user1=mapper.queryUserById(<span class="number">1</span>);</span><br><span class="line">    User user2=mapper.queryUserById(<span class="number">1</span>);</span><br><span class="line">    System.out.println(user1);</span><br><span class="line">    System.out.println(user2);</span><br><span class="line">    sqlSession.close();</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>如上代码所示，在getSqlSession和sqlSession.close之间就是一级缓存的作用域</p>
<p><strong>缓存失效的情况：</strong></p>
<ol>
<li><p>查询不同的东西</p>
</li>
<li><p>增删改操作，可能会改变原来的数据，所以必定会刷新缓存</p>
</li>
<li><p>查询不同的Mapper.xml</p>
</li>
<li><p>手动清理缓存（两次查询相同内容之间清理缓存）</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">sqlSession.clearCache();</span><br></pre></td></tr></table></figure></li>
</ol>
<p>增删改可能会改变原来的数据，所以必定会刷新</p>
<p><strong>一级缓存只在一个SqlSession中有效，适用场景：用户多次刷新当前页面</strong></p>
<h4 id="12-4-二级缓存"><a href="#12-4-二级缓存" class="headerlink" title="12.4 二级缓存"></a>12.4 二级缓存</h4><ul>
<li><p>二级缓存也叫全局缓存，一级缓存作用域太低了，所以诞生了二级缓存</p>
</li>
<li><p>基于namespace级别的缓存，一个名称空间，对应一个二级缓存（Mapper级别的缓存，一个Mapper对应一个二级缓存）</p>
</li>
<li><p>工作机制</p>
<ul>
<li>一个会话查询一条数据，这个数据就会被放在当前会话的一级缓存中</li>
<li>如果会话关闭了，这个会话对应的一级缓存就没了；但是我们想要的是，会话关闭了，一级缓存中的数据被保存到二级缓存中</li>
<li>新的会话查询信息，就可以从二级缓存中获取内容</li>
<li>不同的mapper查询出的数据会放在自己对应的缓存（map）中</li>
</ul>
</li>
<li><p>二级缓存需要手动开启和配置，他是基于namespace级别的缓存。</p>
</li>
<li><p>为了提高可扩展性，MyBatis定义了缓存接口Cache。我们可以通过实现Cache接口来定义二级缓存。</p>
</li>
</ul>
<p>步骤：</p>
<ol>
<li>开启全局缓存</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;cacheEnabled&quot;</span> <span class="attr">value</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br><span class="line"><span class="comment">&lt;!--    显示的声明所有mapper中sql语句缓存都开启    --&gt;</span></span><br></pre></td></tr></table></figure>

<ol start="2">
<li>开启二级缓存(*Mapper.xml)中</li>
</ol>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">cache</span>/&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="comment">&lt;!-- 定制化cache --&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">cache</span></span></span><br><span class="line"><span class="tag">  <span class="attr">eviction</span>=<span class="string">&quot;FIFO&quot;</span></span></span><br><span class="line"><span class="tag">  <span class="attr">flushInterval</span>=<span class="string">&quot;60000&quot;</span></span></span><br><span class="line"><span class="tag">  <span class="attr">size</span>=<span class="string">&quot;512&quot;</span></span></span><br><span class="line"><span class="tag">  <span class="attr">readOnly</span>=<span class="string">&quot;true&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>

<blockquote>
<p>这个更高级的配置创建了一个 FIFO 缓存，每隔 60 秒刷新，最多可以存储结果对象或列表的 512 个引用，而且返回的对象被认为是只读的，因此对它们进行修改可能会在不同线程中的调用者产生冲突。</p>
</blockquote>
<p>如下代码，调整<code>sqlSession1.close();</code>的位置，可以得到显著区别</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line"><span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">test</span><span class="params">()</span></span>&#123;</span><br><span class="line">    SqlSession sqlSession1 = MybatisUtils.getSqlSession();</span><br><span class="line">    SqlSession sqlSession2 = MybatisUtils.getSqlSession();</span><br><span class="line"></span><br><span class="line">    UserMapper mapper1 = sqlSession1.getMapper(UserMapper.class);</span><br><span class="line">    UserMapper mapper2 = sqlSession2.getMapper(UserMapper.class);</span><br><span class="line">    Long time1 = System.currentTimeMillis();</span><br><span class="line">    User user1 = mapper1.queryUserById(<span class="number">1</span>);</span><br><span class="line">    Long time2 = System.currentTimeMillis();</span><br><span class="line">    System.out.println(time2-time1);</span><br><span class="line">        sqlSession1.close();</span><br><span class="line">    Long time3 = System.currentTimeMillis();</span><br><span class="line">    User user2 = mapper2.queryUserById(<span class="number">1</span>);</span><br><span class="line">    Long time4 = System.currentTimeMillis();</span><br><span class="line">    System.out.println(time4-time3);</span><br><span class="line">    </span><br><span class="line">    <span class="comment">//	sqlSession1.close();</span></span><br><span class="line">    sqlSession2.close();</span><br><span class="line"></span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<p>前一种关闭，结果如下：</p>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211129153311467.png" alt="image-20211129153311467"></p>
<p>后一种关闭，结果如下：</p>
<p><img src="/2021/11/20/mybatis%E6%95%99%E7%A8%8B/image-20211129153222896.png" alt="image-20211129153222896"></p>
<p>可以很明显的看到，前者第二次查询时，只查到缓存得到了结果，后者则需要查询两次数据库</p>
<ul>
<li><strong>由此可以得到二级缓存的原理：一级缓存默认存在，当sqlSession关闭的时候，一级缓存中的内容传递到二级缓存中</strong></li>
</ul>
<blockquote>
<p>一个注意点：</p>
<p>使用二级缓存时，必须让Bean序列化，即实现<strong>Serializable</strong>接口</p>
</blockquote>
<h4 id="12-5-Mybatis缓存原理"><a href="#12-5-Mybatis缓存原理" class="headerlink" title="12.5 Mybatis缓存原理"></a>12.5 Mybatis缓存原理</h4><p><img src="https://img-blog.csdnimg.cn/20200623165404113.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0RERERlbmdf,size_16,color_FFFFFF,t_70#pic_center" alt="原理图"></p>
<p>Mybatis缓存原理如图：</p>
<p>当一个用户请求进来后，先查看二级缓存，二级缓存没有再去查对应的sqlSession的一级缓存，还没有就去查数据库</p>
<p>每当sqlSession关闭的时候，就把数据从一级缓存提交到二级缓存</p>
<h4 id="12-6-自定义缓存"><a href="#12-6-自定义缓存" class="headerlink" title="12.6 自定义缓存"></a>12.6 自定义缓存</h4><p>通过cache的type属性指明自定义缓存</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">cache</span> <span class="attr">type</span>=<span class="string">&quot;org.mybatis.caches.ehcache.EhcacheCache&quot;</span>/&gt;</span></span><br></pre></td></tr></table></figure>



<h3 id="十三、bug记录"><a href="#十三、bug记录" class="headerlink" title="十三、bug记录"></a>十三、bug记录</h3><h4 id="13-1-bug1"><a href="#13-1-bug1" class="headerlink" title="13.1 bug1"></a>13.1 bug1</h4><figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.mars.mapper.UserMapper.selectUsers</span><br></pre></td></tr></table></figure>

<p>网上分析说是xml文件绑定失败，有以下几种情况：</p>
<ul>
<li><p>mapper被maven过滤了——添加build约束【建议添加在顶级Maven模块的pom中】</p>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">build</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">resources</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">resource</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">directory</span>&gt;</span>src/main/java<span class="tag">&lt;/<span class="name">directory</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">includes</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">include</span>&gt;</span>**/*.properties<span class="tag">&lt;/<span class="name">include</span>&gt;</span></span><br><span class="line">                <span class="tag">&lt;<span class="name">include</span>&gt;</span>**/*.xml<span class="tag">&lt;/<span class="name">include</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;/<span class="name">includes</span>&gt;</span></span><br><span class="line">            <span class="tag">&lt;<span class="name">filtering</span>&gt;</span>true<span class="tag">&lt;/<span class="name">filtering</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;/<span class="name">resource</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">resources</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">build</span>&gt;</span></span><br></pre></td></tr></table></figure></li>
<li><p><strong>xml与mapper不对应</strong></p>
<ul>
<li>namespace与mapper不对【注意namespace是全限定名】</li>
<li>id和mapper里面的方法名不对应【必须完全对应，大小写都必须完全对应】</li>
<li>parameterType对应不上【必须是完全限定名或者config中配置了的别名】</li>
</ul>
</li>
</ul>
<h3 id="补充：cj-jdbc和jdbc"><a href="#补充：cj-jdbc和jdbc" class="headerlink" title="补充：cj.jdbc和jdbc"></a>补充：cj.jdbc和jdbc</h3><p>mysql-connector-java6以上的都必须使用cj.jdbc！</p>

      

      
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                    <ol class="toc"><li class="toc-item toc-level-2"><a class="toc-link" href="#Mybatis%E6%95%99%E7%A8%8B"><span class="toc-number">1.</span> <span class="toc-text">Mybatis教程</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%80%E3%80%81Intro"><span class="toc-number">1.1.</span> <span class="toc-text">一、Intro</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#1-1-%E4%BB%80%E4%B9%88%E6%98%AFMybatis"><span class="toc-number">1.1.1.</span> <span class="toc-text">1.1 什么是Mybatis</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-2-%E6%8C%81%E4%B9%85%E5%8C%96"><span class="toc-number">1.1.2.</span> <span class="toc-text">1.2 持久化</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-3-%E6%8C%81%E4%B9%85%E5%B1%82"><span class="toc-number">1.1.3.</span> <span class="toc-text">1.3 持久层</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#1-4-%E4%B8%BA%E4%BB%80%E4%B9%88%E9%9C%80%E8%A6%81Mybatis"><span class="toc-number">1.1.4.</span> <span class="toc-text">1.4 为什么需要Mybatis</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%BA%8C%E3%80%81%E7%AC%AC%E4%B8%80%E4%B8%AAMybatis%E7%A8%8B%E5%BA%8F"><span class="toc-number">1.2.</span> <span class="toc-text">二、第一个Mybatis程序</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#2-0-%E5%88%9B%E5%BB%BA%E6%95%B0%E6%8D%AE%E5%BA%93"><span class="toc-number">1.2.1.</span> <span class="toc-text">2.0 创建数据库</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-1-%E6%90%AD%E5%BB%BA%E7%8E%AF%E5%A2%83"><span class="toc-number">1.2.2.</span> <span class="toc-text">2.1 搭建环境</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-2-%E9%85%8D%E7%BD%AEmybatis"><span class="toc-number">1.2.3.</span> <span class="toc-text">2.2 配置mybatis</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#2-4-%E6%B5%8B%E8%AF%95"><span class="toc-number">1.2.4.</span> <span class="toc-text">2.4 测试</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%89%E3%80%81CRUD"><span class="toc-number">1.3.</span> <span class="toc-text">三、CRUD</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#3-1-%E5%A2%9E%EF%BC%9ACreate%E2%80%94%E2%80%94Insert"><span class="toc-number">1.3.1.</span> <span class="toc-text">3.1 增：Create——Insert</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-2-%E6%9F%A5%EF%BC%9ARetrieve%E2%80%94%E2%80%94select"><span class="toc-number">1.3.2.</span> <span class="toc-text">3.2 查：Retrieve——select</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-3-%E6%94%B9%EF%BC%9AUpdate%E2%80%94%E2%80%94update"><span class="toc-number">1.3.3.</span> <span class="toc-text">3.3 改：Update——update</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-4-%E5%88%A0%EF%BC%9ADelete%E2%80%94%E2%80%94delete"><span class="toc-number">1.3.4.</span> <span class="toc-text">3.4 删：Delete——delete</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-5-Map%E8%AF%A6%E8%A7%A3%EF%BC%9A"><span class="toc-number">1.3.5.</span> <span class="toc-text">3.5 Map详解：</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-6-%E6%A8%A1%E7%B3%8A%E6%9F%A5%E8%AF%A2%EF%BC%88%EF%BC%9F%EF%BC%9F%EF%BC%9F%EF%BC%89"><span class="toc-number">1.3.6.</span> <span class="toc-text">3.6 模糊查询（？？？）</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#3-7-%E5%B8%B8%E8%A7%81%E9%94%99%E8%AF%AF"><span class="toc-number">1.3.7.</span> <span class="toc-text">3.7 常见错误</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%9B%9B%E3%80%81%E9%85%8D%E7%BD%AE%E8%A7%A3%E6%9E%90"><span class="toc-number">1.4.</span> <span class="toc-text">四、配置解析</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#4-1-%E6%A0%B8%E5%BF%83%E9%85%8D%E7%BD%AE%E6%96%87%E4%BB%B6%E2%80%94%E2%80%94mybatis-config-xml"><span class="toc-number">1.4.1.</span> <span class="toc-text">4.1 核心配置文件——mybatis-config.xml</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#4-2-%E5%B1%9E%E6%80%A7%E8%AF%A6%E8%A7%A3"><span class="toc-number">1.4.2.</span> <span class="toc-text">4.2 属性详解</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A0environments%EF%BC%9A"><span class="toc-number">1.4.2.1.</span> <span class="toc-text">①environments：</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A1properties%EF%BC%9A"><span class="toc-number">1.4.2.2.</span> <span class="toc-text">②properties：</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A2%E7%B1%BB%E5%9E%8B%E5%88%AB%E5%90%8DtypeAliases"><span class="toc-number">1.4.2.3.</span> <span class="toc-text">③类型别名typeAliases</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A3%E8%AE%BE%E7%BD%AESettings"><span class="toc-number">1.4.2.4.</span> <span class="toc-text">④设置Settings</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A4%E5%85%B6%E4%BB%96%E9%85%8D%E7%BD%AE"><span class="toc-number">1.4.2.5.</span> <span class="toc-text">⑤其他配置</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A5Mappers%E6%98%A0%E5%B0%84%E5%99%A8%EF%BC%9A"><span class="toc-number">1.4.2.6.</span> <span class="toc-text">⑥Mappers映射器：</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#%E2%91%A6%E4%BD%9C%E7%94%A8%E5%9F%9F%E5%92%8C%E7%94%9F%E5%91%BD%E5%91%A8%E6%9C%9F%E9%97%AE%E9%A2%98"><span class="toc-number">1.4.2.7.</span> <span class="toc-text">⑦作用域和生命周期问题</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%BA%94%E3%80%81%E5%88%9D%E8%AF%86ResultMap"><span class="toc-number">1.5.</span> <span class="toc-text">五、初识ResultMap</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%85%AD%E3%80%81%E6%97%A5%E5%BF%97"><span class="toc-number">1.6.</span> <span class="toc-text">六、日志</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#6-1-%E6%97%A5%E5%BF%97%E5%B7%A5%E5%8E%82"><span class="toc-number">1.6.1.</span> <span class="toc-text">6.1 日志工厂</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#6-2-LOG4J"><span class="toc-number">1.6.2.</span> <span class="toc-text">6.2 LOG4J</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B8%83%E3%80%81%E5%88%86%E9%A1%B5"><span class="toc-number">1.7.</span> <span class="toc-text">七、分页</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#7-1-sql%E5%B1%82%E9%9D%A2%E5%88%86%E9%A1%B5%E3%80%90%E6%8E%A8%E8%8D%90%E3%80%91"><span class="toc-number">1.7.1.</span> <span class="toc-text">7.1 sql层面分页【推荐】</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#7-2-RowBounds%E7%B1%BB%E3%80%90%E8%BF%87%E6%97%B6%E4%BA%86%E3%80%91"><span class="toc-number">1.7.2.</span> <span class="toc-text">7.2 RowBounds类【过时了】</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#7-3-%E5%88%86%E9%A1%B5%E6%8F%92%E4%BB%B6"><span class="toc-number">1.7.3.</span> <span class="toc-text">7.3 分页插件</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%85%AB%E3%80%81%E4%BD%BF%E7%94%A8%E6%B3%A8%E8%A7%A3%E5%BC%80%E5%8F%91"><span class="toc-number">1.8.</span> <span class="toc-text">八、使用注解开发</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#8-1-%E9%9D%A2%E5%90%91%E6%8E%A5%E5%8F%A3%E7%BC%96%E7%A8%8B"><span class="toc-number">1.8.1.</span> <span class="toc-text">8.1 面向接口编程</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#8-2-%E4%BD%BF%E7%94%A8%E6%B3%A8%E8%A7%A3%E5%BC%80%E5%8F%91"><span class="toc-number">1.8.2.</span> <span class="toc-text">8.2 使用注解开发</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#8-3-Mybatis%E6%89%A7%E8%A1%8C%E6%B5%81%E7%A8%8B"><span class="toc-number">1.8.3.</span> <span class="toc-text">8.3 Mybatis执行流程</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#8-4-%E6%B3%A8%E8%A7%A3CRUD"><span class="toc-number">1.8.4.</span> <span class="toc-text">8.4 注解CRUD</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E4%B9%9D%E3%80%81LOMBOK"><span class="toc-number">1.9.</span> <span class="toc-text">九、LOMBOK</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8D%81%E3%80%81%E8%AF%A6%E8%A7%A3ResultMap"><span class="toc-number">1.10.</span> <span class="toc-text">十、详解ResultMap</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#10-1-%E8%B5%B7%E6%AD%A5"><span class="toc-number">1.10.1.</span> <span class="toc-text">10.1 起步</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#A%EF%BC%9AResultType"><span class="toc-number">1.10.1.1.</span> <span class="toc-text">A：ResultType</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#B%EF%BC%9AResultMap"><span class="toc-number">1.10.1.2.</span> <span class="toc-text">B：ResultMap</span></a></li></ol></li><li class="toc-item toc-level-4"><a class="toc-link" href="#10-2-ResultMap%E5%A4%8D%E6%9D%82%E6%9F%A5%E8%AF%A2%E8%AF%A6%E8%A7%A3"><span class="toc-number">1.10.2.</span> <span class="toc-text">10.2 ResultMap复杂查询详解</span></a><ol class="toc-child"><li class="toc-item toc-level-5"><a class="toc-link" href="#A%EF%BC%9A%E5%A4%9A%E5%AF%B9%E4%B8%80%E9%97%AE%E9%A2%98"><span class="toc-number">1.10.2.1.</span> <span class="toc-text">A：多对一问题</span></a></li><li class="toc-item toc-level-5"><a class="toc-link" href="#B%EF%BC%9A%E4%B8%80%E5%AF%B9%E5%A4%9A%E9%97%AE%E9%A2%98"><span class="toc-number">1.10.2.2.</span> <span class="toc-text">B：一对多问题</span></a></li></ol></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8D%81%E4%B8%80%E3%80%81%E5%8A%A8%E6%80%81SQL"><span class="toc-number">1.11.</span> <span class="toc-text">十一、动态SQL</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#11-1-if"><span class="toc-number">1.11.1.</span> <span class="toc-text">11.1 if</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#11-2-choose-when-otherwise"><span class="toc-number">1.11.2.</span> <span class="toc-text">11.2 choose,when,otherwise</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#11-3-set-where-trim"><span class="toc-number">1.11.3.</span> <span class="toc-text">11.3 set where trim</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#11-4-foreach"><span class="toc-number">1.11.4.</span> <span class="toc-text">11.4 foreach</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#11-5-SQL%E7%89%87%E6%AE%B5"><span class="toc-number">1.11.5.</span> <span class="toc-text">11.5 SQL片段</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8D%81%E4%BA%8C%E3%80%81%E7%BC%93%E5%AD%98"><span class="toc-number">1.12.</span> <span class="toc-text">十二、缓存</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#12-1-%E7%BC%93%E5%AD%98%E4%BB%8B%E7%BB%8D"><span class="toc-number">1.12.1.</span> <span class="toc-text">12.1 缓存介绍</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#12-2-Mybatis%E7%BC%93%E5%AD%98"><span class="toc-number">1.12.2.</span> <span class="toc-text">12.2 Mybatis缓存</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#12-3-%E4%B8%80%E7%BA%A7%E7%BC%93%E5%AD%98%EF%BC%88%E6%9C%AC%E5%9C%B0%E7%BC%93%E5%AD%98%EF%BC%89"><span class="toc-number">1.12.3.</span> <span class="toc-text">12.3 一级缓存（本地缓存）</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#12-4-%E4%BA%8C%E7%BA%A7%E7%BC%93%E5%AD%98"><span class="toc-number">1.12.4.</span> <span class="toc-text">12.4 二级缓存</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#12-5-Mybatis%E7%BC%93%E5%AD%98%E5%8E%9F%E7%90%86"><span class="toc-number">1.12.5.</span> <span class="toc-text">12.5 Mybatis缓存原理</span></a></li><li class="toc-item toc-level-4"><a class="toc-link" href="#12-6-%E8%87%AA%E5%AE%9A%E4%B9%89%E7%BC%93%E5%AD%98"><span class="toc-number">1.12.6.</span> <span class="toc-text">12.6 自定义缓存</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E5%8D%81%E4%B8%89%E3%80%81bug%E8%AE%B0%E5%BD%95"><span class="toc-number">1.13.</span> <span class="toc-text">十三、bug记录</span></a><ol class="toc-child"><li class="toc-item toc-level-4"><a class="toc-link" href="#13-1-bug1"><span class="toc-number">1.13.1.</span> <span class="toc-text">13.1 bug1</span></a></li></ol></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E8%A1%A5%E5%85%85%EF%BC%9Acj-jdbc%E5%92%8Cjdbc"><span class="toc-number">1.14.</span> <span class="toc-text">补充：cj.jdbc和jdbc</span></a></li></ol></li></ol>
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